OS Command Injection in ZyXEL Communications Corp. products - CVE-2025-11730
Published: February 5, 2026
Vulnerability identifier: #VU122411
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2025-11730
CWE-ID: CWE-78
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: ZyXEL Communications Corp.
Affected software:
ATP series
USG FLEX series
USG FLEX 50W
USG20W-VPN
ATP series
USG FLEX series
USG FLEX 50W
USG20W-VPN
Detailed vulnerability description
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.
How to mitigate CVE-2025-11730
Install updates from vendor's website.