Main Vulnerability Database Vulnerabilities #VU75460

OS Command Injection in ZyXEL Communications Corp. products - CVE-2023-27991

Published: April 25, 2023

Vulnerability identifier: #VU75460

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2023-27991

CWE-ID: CWE-78

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation. A remote user can pass specially crafted data to the application and execute arbitrary OS commands on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Affected software

ATP series
USG FLEX series
VPN series
USG FLEX 50W
USG20W-VPN

How to mitigate CVE-2023-27991

Install update from vendor's website.

ATP series - update to 5.36
USG FLEX series - update to 5.36
USG FLEX 50W - update to 5.36
USG20W-VPN - update to 5.36
VPN series - update to 5.36

External References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-xss-vulnerability-and-post-authentication-command-injection-vulnerability-in-firewalls

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