Unrated severityNVD Advisory· Published Oct 21, 2025· Updated Feb 26, 2026

CVE-2025-9133

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.

Affected products

Zyxel/ATP seriesllm-fuzzy
Range: >=4.32 <=5.40
Zyxel/USG FLEX seriesllm-fuzzy
Range: >=4.50 <=5.40
Zyxel/ATP series firmwarev5
Range: versions from V4.32 through V5.40
Zyxel/USG20(W)-VPN series firmwarev5
Range: versions from V4.16 through V5.40
Zyxel/USG FLEX 50(W) series firmwarev5
Range: versions from V4.16 through V5.40
Zyxel/USG FLEX series firmwarev5
Range: versions from V4.50 through V5.40

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

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

News mentions

No linked articles in our index yet.

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