CVE-2025-9133

Name: CVE-2025-9133
Creator: NVD / NIST
Published: 2025-10-21T03:15:36.563+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 5.46%

Last modified Jun 17, 2026

CVE-2025-9133 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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.. EPSS estimates a 5.46% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.1/10

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

EPSS Probability

5.46%

91.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-862

Affected Software

Vendor	Product	Versions
Zyxel	Zld	>= 4.32, < 5.41
Zyxel	Zld	>= 4.50, < 5.41
Zyxel	Zld	>= 4.16, < 5.41

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

Timeline

Published: Oct 21, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-9133?

How severe is CVE-2025-9133?

CVE-2025-9133 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 5.46% probability of exploitation in the next 30 days.

How do I fix CVE-2025-9133?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-9133?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST