SecuriTricks - 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.

Product(s) Impacted

Vendor	Product	Versions
Zyxel	Atp Usg Flex Usg Flex 50 Usg20	* * w vpn

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-862

Missing Authorization

The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	zyxel	atp	/	4.32-5.40	/	/	/	/	/	/
a	zyxel	usg_flex	/	4.50-5.40	/	/	/	/	/	/
a	zyxel	usg_flex_50	w	/	4.16-5.40	/	/	/	/	/
a	zyxel	usg20	vpn	/	4.16-5.40	/	/	/	/	/

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-10-21-2025

CVSS Score

8.1 / 10

CVSS Data - 3.1

Attack Vector: NETWORK
Attack Complexity: LOW
Privileges Required: LOW
Scope: UNCHANGED
Confidentiality Impact: HIGH
Integrity Impact: HIGH
Availability Impact: NONE

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

View Vector String

Timeline

Published: Oct. 21, 2025, 3:15 a.m.
Last Modified: Oct. 21, 2025, 7:31 p.m.

Status : Awaiting Analysis

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

security@zyxel.com.tw

CVE-2025-9133