CVE-2022-20812: cisco cisco telepresence video communication server (vcs) expressway

Vulnerability summary

CVE-2022-20812 is a critical (CVSS 9.0) vulnerability in cisco cisco telepresence video communication server (vcs) expressway. EPSS estimates a 1.93% chance of exploitation in the next 30 days, higher than 79.7% of scored vulnerabilities.

Timeline

1. 06-07-2022
   PublishedVulnerability first disclosed.
2. 06-11-2024
   Last modifiedVulnerability information updated.

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.

• CWE-158Improper Neutralization of Null Byte or NUL CharacterThe product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes NUL characters or null bytes when they are sent to a downstream component.
• CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.