CVE-2025-11730

HIGH

Zyxel ATP-USG FLEX-50(W)-USG20(W)-VPN <5.41 - Command Injection

Title source: llm

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.

References (1)

[Various Sources] 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

Scores

CVSS v3 7.2

EPSS 0.0026

EPSS Percentile 48.8%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Classification

CWE

CWE-78

Status draft

Timeline

Published Feb 05, 2026

Tracked Since Feb 18, 2026