Related Vulnerabilities: CVE-2010-0577

Cisco IOS® Software is affected by a denial of service vulnerability that may allow a remote unauthenticated attacker to cause an affected device to reload or hang. The vulnerability may be triggered by a TCP segment containing crafted TCP options that is received during the TCP session establishment phase. In addition to specific, crafted TCP options, the device must have a special configuration to be affected by this vulnerability. Cisco has released software updates that address this vulnerability. This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100324-tcp. Note: The March 24, 2010, Cisco IOS Software Security Advisory bundled publication includes seven Security Advisories. All the advisories address vulnerabilities in Cisco IOS Software. Each advisory lists the releases that correct the vulnerability or vulnerabilities detailed in the advisory. The table at the following URL lists releases that correct all Cisco IOS Software vulnerabilities that have been published on March 24, 2010, or earlier: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100324-bundle Individual publication links are in "Cisco Event Response: Semiannual Cisco IOS Software Security Advisory Bundled Publication" at the following link: http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_mar10.html

Source

Summary

Cisco IOS^® Software is affected by a denial of service vulnerability that may allow a remote unauthenticated attacker to cause an affected device to reload or hang. The vulnerability may be triggered by a TCP segment containing crafted TCP options that is received during the TCP session establishment phase. In addition to specific, crafted TCP options, the device must have a special configuration to be affected by this vulnerability.

Cisco has released software updates that address this vulnerability.

This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100324-tcp.

Note: The March 24, 2010, Cisco IOS Software Security Advisory bundled publication includes seven Security Advisories. All the advisories address vulnerabilities in Cisco IOS Software. Each advisory lists the releases that correct the vulnerability or vulnerabilities detailed in the advisory. The table at the following URL lists releases that correct all Cisco IOS Software vulnerabilities that have been published on March 24, 2010, or earlier:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100324-bundle

Individual publication links are in "Cisco Event Response: Semiannual Cisco IOS Software Security Advisory Bundled Publication" at the following link:

http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_mar10.html

Affected Products

Vulnerable Products
Vulnerable devices are running an affected version of Cisco IOS Software, and are configured for any of the following:

A specific TCP window size

TCP path MTU discovery (PMTUD)

Stateful Network Address Translation (SNAT) with TCP as the transport protocol

Configurations Using a Specific TCP Window Size

Devices configured to use a specific TCP receive window size for connections originating on the device are affected by this vulnerability. A device configured with a specific TCP receive window size has the following command in its configuration:

ip tcp window-size

If the TCP window size has not been explicitly configured with the command ip tcp window-size then the device is not affected by the vulnerability.

Configurations Using Path MTU Discovery

Devices configured to use PMTUD for TCP connections originating or terminating on the device are also affected by this vulnerability. Different Cisco IOS Software features may allow to enable or disable PMTUD on a per-feature basis. The following list contains features known to enable PMTUD for TCP connections:

TCP over IPv4: the ip tcp path-mtu-discovery command enables PMTUD for all new TCP over IPv4 connections from the device. This command is disabled by default.

TCP over IPv6: PMTUD is enabled by default for IPV6 and cannot be disabled.

Border Gateway Protocol (BGP): recent versions of Cisco IOS Software (Cisco IOS Release 12.2(33)SRA, 12.2(31)SB, 12.2(33)SXH, 12.4(20)T and later releases) automatically enable PMTUD for all BGP neighbor sessions when BGP is configured. Refer to http://www.cisco.com/en/US/docs/ios/12_2sr/12_2sra/feature/guide/srbgpmtu.html for details.

Other features like generic routing encapsulation (GRE), IP-in-IP tunneling, and Layer 2 Tunneling Protocol (L2TP) also allow the use of PMTUD. However, these are not related to TCP services and therefore are not affected by this vulnerability.

Configurations Using Stateful NAT with TCP as the Transport Protocol

Devices configured to use SNAT are also affected by this vulnerability. A device configured to use SNAT with TCP as the transport protocol has the following commands in its configuration:

ip nat Stateful id redundancy ... protocol tcp !

Note that to be affected under an SNAT configuration scenario, the SNAT transport protocol must be TCP. Recent versions of Cisco IOS Software do not support the use of TCP as the SNAT transport protocol (they only support UDP), in which case the use of SNAT does not make a device vulnerable. SNAT is not enabled by default, and when SNAT is configured, the default transport protocol is TCP if the Cisco IOS Software release supports TCP as a transport protocol for SNAT.

Determining The Cisco IOS Software Version

To determine the Cisco IOS Software release that is running on a Cisco product, administrators can log in to the device and issue the show version command to display the system banner. The system banner confirms that the device is running Cisco IOS Software by displaying text similar to "Cisco Internetwork Operating System Software" or "Cisco IOS Software." The image name is displayed in parentheses, followed by "Version" and the Cisco IOS Software release name. Other Cisco devices do not have the show version command or may provide different output.

The following example identifies a Cisco product that is running Cisco IOS Software Release 12.3(26) with an installed image name of C2500-IS-L:

Router#show version Cisco Internetwork Operating System Software IOS (tm) 2500 Software (C2500-IS-L), Version 12.3(26), RELEASE SOFTWARE (fc2) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2008 by cisco Systems, Inc. Compiled Mon 17-Mar-08 14:39 by dchih

The following example identifies a Cisco product that is running Cisco IOS Software Release 12.4(20)T with an installed image name of C1841-ADVENTERPRISEK9-M:

Router#show version Cisco IOS Software, 1841 Software (C1841-ADVENTERPRISEK9-M), Version 12.4(20)T, RELEASE SOFTWARE (fc3) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2008 by Cisco Systems, Inc. Compiled Thu 10-Jul-08 20:25 by prod_rel_team

Additional information about Cisco IOS Software release naming conventions is available in "White Paper: Cisco IOS Reference Guide" at the following link: http://www.cisco.com/warp/public/620/1.html.
Products Confirmed Not Vulnerable

Cisco IOS XR Software is not affected.

Cisco IOS XE Software is not affected.

No other Cisco products are currently known to be affected by this vulnerability.

Details

Cisco IOS Software is affected by a denial of service vulnerability that may allow a remote unauthenticated attacker to cause a device reload or hang.

The vulnerability may only be triggered by a TCP segment received during the TCP session establishment phase. The received TCP segment must contain crafted, not malformed, TCP options. A TCP three-way handshake does not need to be completed to exploit the vulnerability.

To be affected by this vulnerability, a device must be configured for any of the following:
- A specific TCP receive window size
- PMTUD
- SNAT with TCP as the transport protocol
Refer to the Affected Products section for additional details on these configurations.

The vulnerability exists in the TCP options processing code of Cisco IOS Software. When the vulnerability is triggered, Cisco IOS Software enters an infinite loop that may cause the device to reload or hang. The following syslog messages may indicate that this vulnerability has been exploited:
```
%SYS-3-CPUHOG: Task is running for (128004)msecs, more than (2000)msecs (23/1),process = IP Input.
-Traceback= 0x41CA6AC4 0x41C83170 0x41A22704 0x41F249D4 0x41A24A34 0x41B24C58 
%SYS-2-WATCHDOG: Process aborted on watchdog timeout, process = IP Input.
```
This vulnerability is addressed by Cisco bug ID CSCsz75186 ( registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2010-0577.

BGP Considerations

This vulnerability could be exploited through the BGP port (TCP port 179) if all the following conditions are met:
- The device is configured for one or more of the features that make a device affected, as explained above. Note that in recent versions of Cisco IOS Software, configuring BGP automatically enables PMTUD for all BGP neighbor sessions.
- The source IP address of an attack packet is the IP address of a configured BGP peer.
- If the BGP TTL Security Hack (BTSH)/Generalized TTL Security Mechanism (GTSM) is configured, the TTL of the received attack packet is within the allowed TTL range.
- If the BGP peering session is protected by the TCP MD5 option, the attack packet has the correct MD5 hash.

Workarounds

There are no workarounds to mitigate this vulnerability other than disabling the specific features that make a device vulnerable, if feasible.

Additionally, allowing only legitimate devices to connect to affected devices will help limit exposure to this vulnerability. Refer to the Control Plane Policing and Configuring Infrastructure Access Lists (iACLs) subsections below for further details. Since a TCP three-way handshake is not required, to increase effectiveness, the mitigation must be coupled with anti-spoofing measures on the network edge.

Specific mitigations for BGP are discussed below in the BGP Considerations subsection.

Additional mitigations that can be deployed on Cisco devices within the network are available in the companion document "Cisco Applied Mitigation Bulletin: Identifying and Mitigating Exploitation of the Cisco IOS Software Crafted TCP Packet Denial of Service Vulnerability", which is available at the following location: http://tools.cisco.com/security/center/content/CiscoAppliedMitigationBulletin/cisco-amb-20100324-tcp.

Configurations Using a Specific TCP Window Size

Not setting a specific TCP receive window size can be accomplished by removing the ip tcp window-size command from the configuration.

Configurations Using Path MTU Discovery

PMTUD may be disabled in some of the Cisco IOS Software features that make use of PMTUD. The specific command to use to disable PMTUD varies depending on the specific feature:
- TCP over IPv4: removing the ip tcp path-mtu-discovery command from the configuration will disable PMTUD for TCP over IPv4 sessions that originate on the device.
- TCP over IPv6: PMTUD is enabled by default for IPV6 and cannot be disabled.
- BGP: if BGP is configured on a recent version of Cisco IOS Software that enables PMTUD for BGP sessions, PMTUD can be disabled for all BGP sessions with the no bgp transport path-mtu-discovery command in router configuration mode (Cisco IOS Release 12.2(33)SRA, 12.2(31)SB, 12.2(33)SXH, 12.4(20)T, and later releases).
Configurations Using Stateful NAT with TCP as the Transport Protocol

SNAT can be disabled by removing the ip nat Stateful id command from the configuration.

Control Plane Policing

For devices that need to offer TCP services, it is possible to use Control Plane Policing (CoPP) to block TCP traffic to the device from untrusted sources. Cisco IOS Releases 12.0S, 12.2SX, 12.2S, 12.3T, 12.4, and 12.4T support the CoPP feature. CoPP may be configured on a device to protect the management and control planes to minimize the risk and effectiveness of direct infrastructure attacks by explicitly permitting only authorized traffic sent to infrastructure devices in accordance with existing security policies and configurations. The following example can be adapted to specific network configurations:
```
!-- The 192.168.1.0/24 network and the 172.16.1.1 host are trusted.
!-- Everything else is not trusted. The following access list is used
!-- to determine what traffic needs to be dropped by a control plane
!-- policy (the CoPP feature.) If the access list matches (permit)
!-- then traffic will be dropped and if the access list does not
!-- match (deny) then traffic will be processed by the router.
!-- Note that TCP ports 22 and 23 are just examples; this configuration
!-- needs to be expanded to include all used TCP ports.
access-list 100 deny tcp 192.168.1.0 0.0.0.255 any eq 22
access-list 100 deny tcp 192.168.1.0 0.0.0.255 any eq 23
access-list 100 deny tcp host 172.16.1.1 any eq 22
access-list 100 deny tcp host 172.16.1.1 any eq 23
access-list 100 permit tcp any any


!-- Permit (Police or Drop)/Deny (Allow) all other Layer3 and Layer4
!-- traffic in accordance with existing security policies and
!-- configurations for traffic that is authorized to be sent
!-- to infrastructure devices.
!-- Create a Class-Map for traffic to be policed by
!-- the CoPP feature.
class-map match-all drop-tcp-class
  match access-group 100


!-- Create a Policy-Map that will be applied to the
!-- Control-Plane of the device, and add the "drop-tcp-traffic"
!-- class map.
policy-map control-plane-policy
 class drop-tcp-class
  drop


!-- Apply the Policy-Map to the Control-Plane of the
!-- device.
control-plane
 service-policy input control-plane-policy
```
Warning: Because a TCP three-way handshake is not required to exploit this vulnerability, it is possible to easily spoof the IP address of the sender, which may defeat access control lists (ACLs) that permit communication to these ports from trusted IP addresses.

In the above CoPP example, the access control entries (ACEs) that match the potential exploit packets with the "permit" action result in these packets being discarded by the policy-map "drop" function, while packets that match the "deny" action (not shown) are not affected by the policy-map drop function. Additional information on the configuration and use of the CoPP feature can be found at http://www.cisco.com/web/about/security/intelligence/coppwp_gs.html and http://www.cisco.com/en/US/docs/ios/12_3t/12_3t4/feature/guide/gtrtlimt.html.

Configuring Infrastructure Access Lists (iACLs)

Although it is often difficult to block traffic transiting your network, it is possible to identify traffic that should never be allowed to target your infrastructure devices and block that traffic at the border of your network. Infrastructure ACLs are considered a network security best practice and should be considered as a long-term addition to good network security as well as a workaround for this specific vulnerability. The white paper entitled "Protecting Your Core: Infrastructure Protection Access Control Lists" presents guidelines and recommended deployment techniques for infrastructure protection ACLs:

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801afc76.shtml

BGP Considerations

BTSH/GTSM can help prevent exploitation of this vulnerability via the BGP port because packets coming from devices that do not pass the TTL check configured via BTSH are dropped before any TCP processing takes place. For information on BTSH refer to: http://www.cisco.com/en/US/docs/ios/12_3t/12_3t7/feature/guide/gt_btsh.html.

MD5 authentication for BGP peering sessions can also help prevent exploitation via the BGP port because the MD5 hash in an attack packet is checked before processing the crafted TCP option. For a detailed discussion on how to configure BGP, refer to the following document: http://www.cisco.com/en/US/docs/ios/12_0/np1/configuration/guide/1cbgp.html.

Fixed Software

When considering software upgrades, also consult http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution.

In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Technical Assistance Center (TAC) or your contracted maintenance provider for assistance.

Each row of the Cisco IOS software table (below) names a Cisco IOS release train. If a given release train is vulnerable, then the earliest possible releases that contain the fix (along with the anticipated date of availability for each, if applicable) are listed in the "First Fixed Release for this Advisory" column of the table. The "First Fixed Release for all Advisories in 24 March 2010 Bundle Publication" column indicates the earliest possible releases which have fixes for all the published vulnerabilities in this Cisco IOS Security Advisory bundled publication. Cisco recommends upgrading to the latest available release where possible.

Major Release	Availability of Repaired Releases
Affected 12.0-Based Releases	First Fixed Release for this Advisory	First Fixed Release for all Advisories in 24 March 2010 Bundle Publication
There are no affected 12.0 based releases
Affected 12.1-Based Releases	First Fixed Release for this Advisory	First Fixed Release for all Advisories in 24 March 2010 Bundle Publication
There are no affected 12.1 based releases
Affected 12.2-Based Releases	First Fixed Release for this Advisory	First Fixed Release for all Advisories in 24 March 2010 Bundle Publication
12.2	Not Vulnerable	Not Vulnerable
12.2B	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release. Releases up to and including 12.2(4)B8 are not vulnerable.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2BC	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release. Releases up to and including 12.2(4)BC1b are not vulnerable.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2BW	Not Vulnerable	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2BX	Vulnerable; first fixed in 12.4 Releases up to and including 12.2(2)BX1 are not vulnerable.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2BY	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.Releases up to and including 12.2(2)BY3 are not vulnerable.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2BZ	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2CX	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2CY	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2CZ	Vulnerable; migrate to any release in 12.2S	Vulnerable; migrate to any release in 12.2SRE
12.2DA	Not Vulnerable	Not Vulnerable
12.2DD	Not Vulnerable	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2DX	Not Vulnerable	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2EW	Not Vulnerable	Not Vulnerable
12.2EWA	Not Vulnerable	Not Vulnerable
12.2EX	Not Vulnerable	Releases up to and including 12.2(37)EX are not vulnerable. Releases 12.2(44)EX and later are not vulnerable; first fixed in 12.2SE
12.2EY	Not Vulnerable	Releases prior to 12.2(37)EY are vulnerable, release 12.2(37)EY and later are not vulnerable
12.2EZ	Not Vulnerable	Not Vulnerable
12.2FX	Not Vulnerable	Not Vulnerable
12.2FY	Not Vulnerable	Not Vulnerable
12.2FZ	Not Vulnerable	Not Vulnerable
12.2IRA	Not Vulnerable	Vulnerable; first fixed in 12.2SRC
12.2IRB	Not Vulnerable	Vulnerable; first fixed in 12.2SRC
12.2IRC	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2IRD	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2IXA	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2IXB	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2IXC	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2IXD	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2IXE	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2IXF	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2IXG	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2IXH	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2JA	Releases up to and including 12.2(4)JA1 are not vulnerable.	Releases up to and including 12.2(4)JA1 are not vulnerable.
12.2JK	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2MB	Not Vulnerable	Not Vulnerable
12.2MC	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; first fixed in 12.4
12.2MRA	Not Vulnerable	Not Vulnerable
12.2S	Not Vulnerable	Releases prior to 12.2(30)S are vulnerable, release 12.2(30)S and later are not vulnerable;
12.2SB	Not Vulnerable	12.2(33)SB8 12.2(31)SB18; Available on 24-MAR-10
12.2SBC	Not Vulnerable	Vulnerable; migrate to any release in 12.2SRE
12.2SCA	Not Vulnerable	Vulnerable; first fixed in 12.2SCB
12.2SCB	Not Vulnerable	12.2(33)SCB6
12.2SCC	Not Vulnerable	12.2(33)SCC1
12.2SCD	Not Vulnerable	Not Vulnerable
12.2SE	Not Vulnerable	12.2(50)SE4; Available on 25-MAR-10
12.2SEA	Not Vulnerable	Not Vulnerable
12.2SEB	Not Vulnerable	Not Vulnerable
12.2SEC	Not Vulnerable	Not Vulnerable
12.2SED	Not Vulnerable	Vulnerable; first fixed in 12.2SE
12.2SEE	Not Vulnerable	Vulnerable; first fixed in 12.2SE
12.2SEF	Not Vulnerable	Not Vulnerable
12.2SEG	Not Vulnerable	Releases prior to 12.2(25)SEG4 are vulnerable, release 12.2(25)SEG4 and later are not vulnerable; first fixed in 12.2SE
12.2SG	Not Vulnerable	Releases up to 12.2(31)SG1 are not vulnerable; releases 12.2(40)SG and later are not vulnerable.
12.2SGA	Not Vulnerable	Not Vulnerable
12.2SL	Not Vulnerable	Not Vulnerable
12.2SM	Not Vulnerable	Not Vulnerable
12.2SO	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2SQ	Not Vulnerable	Not Vulnerable
12.2SRA	Not Vulnerable	Vulnerable; first fixed in 12.2SRD
12.2SRB	Not Vulnerable	Vulnerable; first fixed in 12.2SRD
12.2SRC	Not Vulnerable	12.2(33)SRC5
12.2SRD	Not Vulnerable	12.2(33)SRD3
12.2SRE	Not Vulnerable	Not Vulnerable
12.2STE	Not Vulnerable	Not Vulnerable
12.2SU	Not Vulnerable	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2SV	Not Vulnerable	Releases up to and including 12.2(18)SV2 are not vulnerable.
12.2SVA	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2SVC	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2SVD	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2SVE	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2SW	Not Vulnerable	Releases up to and including 12.2(25)SW3 are not vulnerable. Releases 12.2(25)SW12 and later are not vulnerable; first fixed in 15.0M
12.2SX	Not Vulnerable	Vulnerable; first fixed in 12.2SXF
12.2SXA	Not Vulnerable	Vulnerable; first fixed in 12.2SXF
12.2SXB	Not Vulnerable	Vulnerable; first fixed in 12.2SXF
12.2SXD	Not Vulnerable	Vulnerable; first fixed in 12.2SXF
12.2SXE	Not Vulnerable	Vulnerable; first fixed in 12.2SXF
12.2SXF	Not Vulnerable	12.2(18)SXF17a
12.2SXH	Not Vulnerable	12.2(33)SXH6
12.2SXI	Not Vulnerable	12.2(33)SXI2a 12.2(33)SXI3
12.2SY	Not Vulnerable	Vulnerable; migrate to any release in 12.2SRE
12.2SZ	Not Vulnerable	Vulnerable; migrate to any release in 12.2SRE
12.2T	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.Releases up to and including 12.2(4)T7 are not vulnerable.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2TPC	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2XA	Not Vulnerable	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2XB	Not Vulnerable	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2XC	Not Vulnerable	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2XD	Not Vulnerable	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2XE	Not Vulnerable	Not Vulnerable
12.2XF	Not Vulnerable	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2XG	Not Vulnerable	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2XH	Not Vulnerable	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2XI	Not Vulnerable	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2XJ	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2XK	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2XL	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2XM	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2XN	Not Vulnerable	Releases prior to 12.2(33)XN1 are vulnerable, release 12.2(33)XN1 and later are not vulnerable; first fixed in 12.2SRC
12.2XNA	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
12.2XNB	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
12.2XNC	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
12.2XND	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
12.2XNE	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
12.2XNF	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
12.2XO	Not Vulnerable	Not Vulnerable
12.2XQ	Not Vulnerable	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2XR	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.Releases up to and including 12.2(4)XR are not vulnerable.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2XS	Not Vulnerable	Not Vulnerable
12.2XT	Not Vulnerable	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2XU	Not Vulnerable	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2XV	Not Vulnerable	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2XW	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2YA	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2YB	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2YC	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2YD	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2YE	Not Vulnerable	Not Vulnerable
12.2YF	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2YG	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2YH	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2YJ	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2YK	Not Vulnerable	Not Vulnerable
12.2YL	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2YM	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2YN	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2YO	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2YP	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.Releases up to and including 12.2(8)YP are not vulnerable.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2YQ	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2YR	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2YS	Not Vulnerable	Not Vulnerable
12.2YT	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2YU	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2YV	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2YW	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2YX	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2YY	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2YZ	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2ZA	Not Vulnerable	Vulnerable; first fixed in 12.2SXF
12.2ZB	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2ZC	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2ZD	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2ZE	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2ZF	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2ZG	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2ZH	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.2ZJ	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2ZL	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2ZP	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2ZU	Not Vulnerable	Vulnerable; first fixed in 12.2SXH
12.2ZX	Not Vulnerable	Vulnerable; migrate to any release in 12.2SRE
12.2ZY	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.2ZYA	Not Vulnerable	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
Affected 12.3-Based Releases	First Fixed Release for this Advisory	First Fixed Release for all Advisories in 24 March 2010 Bundle Publication
12.3	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3B	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3BC	Vulnerable; migrate to any release in 12.2SCB	Vulnerable; first fixed in 12.2SCB
12.3BW	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3EU	Not Vulnerable	Not Vulnerable
12.3JA	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Releases prior to 12.3(11)JA5 are vulnerable, release 12.3(11)JA5 and later are not vulnerable
12.3JEA	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Releases prior to 12.3(8)JEA4 are vulnerable, release 12.3(8)JEA4 and later are not vulnerable
12.3JEB	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Releases prior to 12.3(8)JEB2 are vulnerable, release 12.3(8)JEB2 and later are not vulnerable
12.3JEC	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.3JED	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.3JK	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3JL	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.3JX	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.3T	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3TPC	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.3VA	Not Vulnerable	Not Vulnerable
12.3XA	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3XB	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.3XC	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3XD	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3XE	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; first fixed in 12.4 Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3XF	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.3XG	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3XI	Note: Releases prior to 12.3(7)XI11 are vulnerable, release 12.3(7)XI11 and later are not vulnerable;	Releases prior to 12.3(7)XI11 are vulnerable, release 12.3(7)XI11 and later are not vulnerable
12.3XJ	Vulnerable; first fixed in 12.4XR	Vulnerable; first fixed in 12.4XR
12.3XK	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3XL	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3XQ	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3XR	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3XS	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3XU	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3XW	Vulnerable; first fixed in 12.4XR	Vulnerable; first fixed in 12.4XR
12.3XX	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3XY	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3XZ	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3YA	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3YD	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3YF	Vulnerable; first fixed in 12.4XR	Vulnerable; first fixed in 12.4XR
12.3YG	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3YH	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3YI	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3YJ	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3YK	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3YM	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3YQ	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3YS	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3YT	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3YU	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.3YX	Vulnerable; first fixed in 12.4XR	Vulnerable; first fixed in 12.4XR
12.3YZ	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.3ZA	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
Affected 12.4-Based Releases	First Fixed Release for this Advisory	First Fixed Release for all Advisories in 24 March 2010 Bundle Publication
12.4	12.4(25c) 15.0(1)M1 15.0(1)M2 ; Available on 26-MAR-10	12.4(25c) 15.0(1)M1
12.4GC	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.4JA	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.4JDA	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.4JDC	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.4JDD	12.4(10b)JDD1 Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	12.4(10b)JDD1
12.4JHA	Not Vulnerable	Not Vulnerable
12.4JK	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.4JL	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.4JMA	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Releases prior to 12.4(3g)JMA2 are vulnerable, release 12.4(3g)JMA2 and later are not vulnerable
12.4JMB	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.4JX	Vulnerable; first fixed in 12.4JA	Vulnerable; first fixed in 12.4JA
12.4MD	12.4(11)MD10 12.4(15)MD4 12.4(24)MD	12.4(24)MD
12.4MDA	12.4(22)MDA2	12.4(22)MDA2
12.4MR	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.4SW	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.4T	12.4(22)T3 12.4(20)T4 12.4(15)T10 12.4(24)T2	12.4(15)T12 12.4(20)T5 12.4(24)T3; Available on 26-MAR-10 12.4(22)T4
12.4XA	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.4XB	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.4XC	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.4XD	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.4XE	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.4XF	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.4XG	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.4XJ	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.4XK	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.4XL	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.4XM	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.4XN	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.4XP	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.4XQ	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.4XR	12.4(22)XR3	12.4(22)XR3
12.4XT	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.4XV	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.4XW	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.4XY	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.4XZ	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.4YA	Vulnerable; migrate to any release in 15.0M or a fixed 12.4T release.	Vulnerable; migrate to any release in 15.0M or a fixed 12.4 release.
12.4YB	12.4(22)YB5	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.4YD	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
12.4YE	12.4(22)YE2 12.4(24)YE	12.4(22)YE2 12.4(24)YE
12.4YG	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory	Vulnerable; Contact your support organization per the instructions in Obtaining Fixed Software section of this advisory
Affected 15.0-Based Releases	First Fixed Release for this Advisory	First Fixed Release for all Advisories in 24 March 2010 Bundle Publication
There are no affected 15.0 based releases
Affected 15.1-Based Releases	First Fixed Release for this Advisory	First Fixed Release for all Advisories in 24 March 2010 Bundle Publication
There are no affected 15.1 based releases

Cisco IOS-XE Software

IOS-XE Release	First Fixed Release
2.1.x	Not Vulnerable
2.2.x	Not Vulnerable
2.3.x	Not Vulnerable
2.4.x	Not Vulnerable
2.5.x	Not Vulnerable
2.6.x	Not Vulnerable

Exploitation and Public Announcements

The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory.

This vulnerability was discovered during the resolution of customer service requests.

Cisco Security Vulnerability Policy

To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.

Subscribe to Cisco Security Notifications

Related to This Advisory

Cisco IOS Software TCP Packet Processing Denial of Service Vulnerability

URL

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20100324-tcp

Revision History

Revision 1.0

2010-March-24

Initial public release

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Legal Disclaimer

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Cisco IOS Software Crafted TCP Packet Denial of Service Vulnerability

Summary

Affected Products

Vulnerable Products

Configurations Using a Specific TCP Window Size

Configurations Using Path MTU Discovery

Configurations Using Stateful NAT with TCP as the Transport Protocol

Determining The Cisco IOS Software Version

Products Confirmed Not Vulnerable

Details

BGP Considerations