CVE-2022-20845 Cisco Network Convergence System 4000 Series TL1 Denial of Service Vulnerability
An authenticated local attacker can cause a memory leak in the TL1 process, leading to a denial of service on Cisco NCS 4000 devices.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2022-20845?
CVE-2022-20845 is a medium-severity denial of service vulnerability in Cisco IOS XR Software, published on 15 Nov 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability in the TL1 function of Cisco Network Convergence System (NCS) 4000 Series could allow an authenticated, local attacker to cause a memory leak in the TL1 process. This vulnerability is due to TL1 not freeing memory under some conditions. An attacker could exploit this vulnerability by connecting to the device and issuing TL1 commands after being authenticated. A successful exploit could allow the attacker to cause the TL1 process to consume large amounts of memory. When the memory reaches a threshold, the Resource Monitor (Resmon) process will begin to restart or shutdown the top five consumers of memory, resulting in a denial of service (DoS).Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.This advisory is part of the September 2022 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see .
Weakness: CWE-789
Which versions are affected by CVE-2022-20845?
How do I fix CVE-2022-20845?
No fix has been published for CVE-2022-20845 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2022-20845 being exploited?
There is no known exploitation of CVE-2022-20845 in the wild and no public exploit code.
Sources
Also known as GHSA-fw7g-x8q3-h9pr.