CVE-2023-27991: zyxel atp series firmware OS Command Injection

Vulnerability summary

CVE-2023-27991 is a high (CVSS 8.8) OS Command Injection vulnerability in zyxel atp series firmware. EPSS estimates a 1.45% chance of exploitation in the next 30 days, higher than 73% of scored vulnerabilities.

Timeline

1. 24-04-2023
   PublishedVulnerability first disclosed.
2. 04-02-2025
   Last modifiedVulnerability information updated.

Description

The post-authentication command injection vulnerability in the CLI command of Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX series firmware versions 4.50 through 5.35, USG FLEX 50(W) firmware versions 4.16 through 5.35, USG20(W)-VPN firmware versions 4.16 through 5.35, and VPN series firmware versions 4.30 through 5.35, which could allow an authenticated attacker to execute some OS commands remotely.

• CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.