Main Vulnerability Database Vulnerabilities #VU122411

OS Command Injection in ZyXEL Communications Corp. products - CVE-2025-11730

Published: February 5, 2026

Vulnerability identifier: #VU122411

CSH Severity: Low

CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-11730

CWE-ID: CWE-78

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability exists due to improper input validation in the Dynamic DNS (DDNS) configuration CLI command. A remote administrator 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
USG FLEX 50W
USG20W-VPN

How to mitigate CVE-2025-11730

Install updates from vendor's website.

ATP series - update to 5.42
USG FLEX series - update to 5.42
USG FLEX 50W - update to 5.42
USG20W-VPN - update to 5.42

External References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-post-authentication-command-injection-vulnerability-in-the-ddns-configuration-cli-command-of-zld-firewalls-02-05-2026

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