CVE-2025-9133

State: Published
Severity: 8.1 High
Published: Oct 21, 2025
Updated: Feb 26, 2026
Reserved: Aug 19, 2025

Description

A missing authorization vulnerability in Zyxel ATP series firmware versions from V4.32 through V5.40, USG FLEX series firmware versions from V4.50 through V5.40, USG FLEX 50(W) series firmware versions from V4.16 through V5.40, and USG20(W)-VPN series firmware versions from V4.16 through V5.40 could allow a semi-authenticated attacker—who has completed only the first stage of the two-factor authentication (2FA) process—to view and download the system configuration from an affected device.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N	Zyxel

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
ATP series firmwareZyxel	versions from V4.32 through V5.40Affected
USG FLEX series firmwareZyxel	versions from V4.50 through V5.40Affected
USG FLEX 50(W) series firmwareZyxel	versions from V4.16 through V5.40Affected
USG20(W)-VPN series firmwareZyxel	versions from V4.16 through V5.40Affected

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-post-authentication-command-injection-and-missing-authorization-vulnerabilities-in-zld-firewalls-10-21-2025vendor-advisory

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