When DNS filtering is enabled on Juniper Networks Junos MX Series with one of the following cards MS-PIC, MS-MIC or MS-MPC, an incoming stream of packets processed by the Multiservices PIC Management Daemon (mspmand) process, responsible for managing "URL Filtering service", may crash, causing the Services PIC to restart. While the Services PIC is restarting, all PIC services including DNS filtering service (DNS sink holing) will be bypassed until the Services PIC completes its boot process. This vulnerability might allow an malicious user to cause an extended Denial of Service (DoS) attack against the device and to cause clients to be vulnerable to DNS based attacks by malicious DNS servers when they send DNS requests through the device. As a result, devices which were once protected by the DNS Filtering service are no longer protected and at risk of exploitation. This issue affects Juniper Networks Junos OS: 17.3 versions before 17.3R3-S8; 18.3 versions before 18.3R3-S1; 18.4 versions before 18.4R3; 19.1 versions before 19.1R3; 19.2 versions before 19.2R2; 19.3 versions before 19.3R3. This issue does not affect Juniper Networks Junos OS 17.4, 18.1, and 18.2.
| Vulnerable Product | Search on Vulmon | Subscribe to Product |
|---|---|---|
juniper junos 17.3 |
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juniper junos 18.3 |
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juniper junos 18.4 |
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juniper junos 19.1 |
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juniper junos 19.2 |
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juniper junos 19.3 |
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