A vulnerability in IP version 6 (IPv6) processing in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a reload of the ipv6_io service. The vulnerability is due to improper processing of a malformed IPv6 packet by a device configured to process such packets. An attacker could exploit this vulnerability by sending a malformed IPv6 packet to be processed by a device that is configured for IPv6. An exploit could allow the attacker to cause a reload of the ipv6_io service. Cisco has confirmed the vulnerability and released software updates. To exploit this vulnerability, an attacker may need to acquire additional information about the targeted device, such as whether the device is configured to process IPv6 packets. A device configured to process IPv6 packets is required for a successful exploit. Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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.
| Version | Description | Section | Status | Date |
| 1.0 | Initial Release | NA | Final | 2015-Jun-17 |
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