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)

Core 1

Core References

Various Sources vendor-advisory

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 0.0010

EPSS Percentile 27.5%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-78

Status published

Products (4)

Zyxel/ATP series firmware versions from V5.35 through V5.41

Zyxel/USG FLEX 50(W) series firmware versions from V5.35 through V5.41

Zyxel/USG FLEX series firmware versions from V5.35 through V5.41

Zyxel/USG20(W)-VPN series firmware versions from V5.35 through V5.41

Published Feb 05, 2026

Tracked Since Feb 18, 2026