CVE-2025-11730

State: Published
Severity: 7.2 High
Published: Feb 5, 2026
Updated: Feb 26, 2026
Reserved: Oct 14, 2025

Description

A post‑authentication command injection vulnerability in the Dynamic DNS (DDNS) configuration CLI command in Zyxel ATP series firmware versions from V5.35 through V5.41, USG FLEX series firmware versions from V5.35 through V5.41, USG FLEX 50(W) series firmware versions from V5.35 through V5.41, and USG20(W)-VPN series firmware versions from V5.35 through V5.41 could allow an authenticated attacker with administrator privileges to execute operating system (OS) commands on an affected device by supplying a specially crafted string as an argument to the CLI command.

Scores

CVSS	Score	Vector	Source
3.1	7.2 High	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H	Zyxel

Weaknesses

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Affected Products

Product	Versions
ATP series firmwareZyxel	versions from V5.35 through V5.41Affected
USG FLEX series firmwareZyxel	versions from V5.35 through V5.41Affected
USG FLEX 50(W) series firmwareZyxel	versions from V5.35 through V5.41Affected
USG20(W)-VPN series firmwareZyxel	versions from V5.35 through V5.41Affected

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-02-05-2026vendor-advisory

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