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No exploitation reportedFix available

CVE-2025-9133

No exploitation reported by the sources we read.

  • Published2025-10-21
  • Fixed in5.41
  • WeaknessCWE-862

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2025-10-2103:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2025-9133?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2025-9133?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Zyxel zldversion to verify
BranchAffectedFixed in
5.41≥ 4.32, < 5.415.41
5.41≥ 4.50, < 5.415.41
5.41≥ 4.16, < 5.415.41

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Zyxel zld to 5.41

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionnone2025-10-22
  • OpenCVESSVC decisionnone—
  • CNACVSS 3.18.1read 2026-10-23
  • CNAweakness (CWE)CWE-862read 2026-10-23
  • FIRST EPSSEPSS score5.5 %2026-10-22

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Published
2025-10-21
Last Modified
2026-10-18
NVD status
Analyzed

Frequently asked questions

What is 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.

Is CVE-2025-9133 actively exploited?

Active exploitation of CVE-2025-9133 has not been confirmed. Its EPSS score was 5.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-9133?

CVE-2025-9133 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

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