Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Cisco / Cisco IOS XR Software | affected 7.4.1; affected 6.8.1; affected 7.4.15; affected 7.5.1; affected 7.4.16; affected 7.6.1; affected 7.5.2; affected 7.8.1; affected 7.6.15; affected 7.5.12; affected 7.7.1; affected 6.8.2; affected 7.4.2; affected 6.9.1; affected 7.6.2; affected 7.5.3; affected 7.7.2; affected 6.9.2; affected 7.9.1; affected 7.10.1; affected 7.8.2; affected 7.5.4; affected 7.8.22; affected 7.7.21; affected 7.9.2; affected 7.5.5; affected 7.11.1; affected 7.9.21; affected 7.10.2; affected 7.6.3 |
CWE
CWE-20
References
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-isis-xehpbVNe
ADP enrichment
No English description supplied.
No references supplied.