CVE-2022-20812 Cisco Expressway Series and Cisco TelePresence Video Communication Server Vulnerabilities

Critical 9.0 Published 6 Jul 2022 Updated 6 Nov 2024

Remote attackers can overwrite arbitrary files or conduct null byte poisoning attacks on Cisco Expressway and TelePresence VCS devices.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2022-20812?

CVE-2022-20812 is a critical path traversal vulnerability in Cisco TelePresence Video Communication Server (VCS) Expressway, published on 6 Jul 2022. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

Multiple vulnerabilities in the API and in the web-based management interface of Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS) could allow a remote attacker to overwrite arbitrary files or conduct null byte poisoning attacks on an affected device. Note: Cisco Expressway Series refers to the Expressway Control (Expressway-C) device and the Expressway Edge (Expressway-E) device. For more information about these vulnerabilities, see the Details section of this advisory.

Weakness: CWE-22, CWE-158

Which versions are affected by CVE-2022-20812?

It affects 2 products.

Products include Cisco Expressway, Cisco Telepresence Video Communication Server.

How do I fix CVE-2022-20812?

No fix has been published for CVE-2022-20812 yet. Limit exposure of the affected software until one is available.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2022-20812 being exploited?

There is no known exploitation of CVE-2022-20812 in the wild and no public exploit code.

Sources

Also known as GHSA-gccr-pgwc-7hq4.