CVE-2025-11730

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-05 · updated 2026-06-17
Weakness: CWE-78

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.

Affected products

Zyxel ATP series firmware: from versions from V5.35 through V5.41
Zyxel USG20(W)-VPN series firmware: from versions from V5.35 through V5.41
Zyxel USG FLEX 50(W) series firmware: from versions from V5.35 through V5.41
Zyxel USG FLEX series firmware: from versions from V5.35 through V5.41

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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