Vulnerability Intelligence Report
CVE-2025-9133
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.
No Active Exploit Signals
CVSS Base Score
8.1
HIGH
Exploitability:2.9
Impact Score:5.2
EPSS Probability:5.46%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-862 ↗CWE-862 Missing Authorization
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Zyxel | ATP series firmware | versions from V4.32 through V5.40 (affected) |
| Zyxel | USG FLEX series firmware | versions from V4.50 through V5.40 (affected) |
| Zyxel | USG FLEX 50(W) series firmware | versions from V4.16 through V5.40 (affected) |
| Zyxel | USG20(W)-VPN series firmware | versions from V4.16 through V5.40 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
5.462%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Zyxel Corporation · Vendor · Taiwan |
| Reserved | 2025-08-19T01:09:14 |
| Published | 2025-10-21T01:57:20 |
| Last Updated | 2026-02-26T16:57:22 |
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