CVE-2024-20406: Cisco IOS XR Software Intermediate System-to-Intermediate System Denial of Service Vulnerability
First published: Wed Sep 11 2024(Updated: )
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.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XRv 9000 | >=6.8.1<7.0.0 | |
| Cisco IOS XRv 9000 | >=7.4.1<7.11.2 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2024-20406?
The severity of CVE-2024-20406 is classified as a denial of service (DoS) vulnerability.
How do I fix CVE-2024-20406?
To fix CVE-2024-20406, you should upgrade to the latest stable release of Cisco IOS XR software that addresses this vulnerability.
Who is affected by CVE-2024-20406?
CVE-2024-20406 affects devices running Cisco IOS XR software versions from 6.8.1 to 7.0.0 and from 7.4.1 to 7.11.2.
What type of attack does CVE-2024-20406 allow?
CVE-2024-20406 allows an unauthenticated adjacent attacker to cause a denial of service (DoS) condition on affected devices.
What should I do if my network uses Cisco IOS XR and I am concerned about CVE-2024-20406?
If your network uses Cisco IOS XR, you should review the software version in use and apply the recommended patch or upgrade to address CVE-2024-20406.
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