Description
A vulnerability in the segment routing feature for the Intermediate System-to-Intermediate System (IS-IS) protocol of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient input validation of ingress IS-IS packets. An attacker could exploit this vulnerability by sending specific IS-IS packets to an affected device after forming an adjacency. A successful exploit could allow the attacker to cause the IS-IS process on all affected devices that are participating in the Flexible Algorithm to crash and restart, resulting in a DoS condition. Note: The IS-IS protocol is a routing protocol. To exploit this vulnerability, an attacker must be Layer 2-adjacent to the affected device and must have formed an adjacency. This vulnerability affects segment routing for IS-IS over IPv4 and IPv6 control planes as well as devices that are configured as level 1, level 2, or multi-level routing IS-IS type.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Cisco Cisco IOS XR Software
Default version status: unknown
7.4.1affected6.8.1affected7.4.15affected7.5.1affected7.4.16affected7.6.1affected7.5.2affected7.8.1affected7.6.15affected7.5.12affected7.7.1affected6.8.2affected7.4.2affected6.9.1affected7.6.2affected7.5.3affected7.7.2affected6.9.2affected7.9.1affected7.10.1affected7.8.2affected7.5.4affected7.8.22affected7.7.21affected7.9.2affected7.5.5affected7.11.1affected7.9.21affected7.10.2affected7.6.3affected