CVE-2025-9133 Missing authorization in ATP series firmware

High 8.1 Published 21 Oct 2025 Updated 26 Feb 2026

A semi-authenticated attacker can bypass full two-factor authentication to view and download system configuration from affected Zyxel firewalls.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-9133?

CVE-2025-9133 is a high-severity missing authorization vulnerability in Zyxel ATP series firmware, published on 21 Oct 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-862

Which versions are affected by CVE-2025-9133?

It affects 1 product.

Products include Zyxel Zld.

How do I fix CVE-2025-9133?

No fix has been published for CVE-2025-9133 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2025-9133 being exploited?

There is no known exploitation of CVE-2025-9133 in the wild and no public exploit code.

Sources

Also known as GHSA-x59x-qc82-4w4p.