CVE-2025-9133

highpriority · track · 2OT risk · elevatedEPSS 0.055 · 93 %ileDEEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

5.46% (93rd) EPSS

CVSS 8.1 · high

Is it mine?

19 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

8.1

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.18.1highAV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Nsecondary · FSTEC (BDU) RU

v3.18.1highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Nsecondary · ENISA EU

v3.18.1highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Nsecondary · security@zyxel.com.twexploitability 2.8 · impact 5.2

v3.17.4highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-862USCWE-862US

affected products (19)

Products and version ranges known to be affected.

Zyxel Firewall ATP <ZLD V5.41all versionscert_bundDE
Zyxel Firewall USG FLEX 50(W) <ZLD V5.41all versionscert_bundDE
Zyxel Firewall USG FLEX <ZLD V5.41all versionscert_bundDE
Zyxel Firewall USG20(W)-VPN <ZLD V5.41all versionscert_bundDE
Zyxel Firewall≤ ATP <ZLD V5.41cert_bundDE
Zyxel Firewall≤ USG FLEX 50(W) <ZLD V5.41cert_bundDE
Zyxel Firewall≤ USG FLEX <ZLD V5.41cert_bundDE
Zyxel Firewall≤ USG20(W)-VPN <ZLD V5.41cert_bundDE
Zyxel ATP series firmware≤ versions from V4.32 through V5.40enisa_euvdEU
Zyxel USG FLEX 50(W) series firmware≤ versions from V4.16 through V5.40enisa_euvdEU
Zyxel USG FLEX series firmware≤ versions from V4.50 through V5.40enisa_euvdEU
Zyxel USG20(W)-VPN series firmware≤ versions from V4.16 through V5.40enisa_euvdEU
Zyxel Communications Corp. ATP4.32 → 5.40fstec_bduRU
Zyxel Communications Corp. USG FLEX4.50 → 5.40fstec_bduRU
Zyxel Communications Corp. USG FLEX 50(W)4.16 → 5.40fstec_bduRU
Zyxel Communications Corp. USG USG20(W)-VPN4.16 → 5.40fstec_bduRU
zyxel zld4.16 → 5.41nvdUScpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:*
zyxel zld4.32 → 5.41nvdUScpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:*
zyxel zld4.50 → 5.41nvdUScpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-2346Zyxel Firewall: Mehrere SchwachstellenDeutsch2025-10-20csaf · cert_bundDE
Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Zyxel Firewall ausnutzen, um beliebigen Programmcode auszuführen, vertrauliche Informationen offenzulegen und Daten zu manipulieren.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund nvd NVD CVE.org MITRE

published 2025-10-21modified 2026-10-18

references (3)

External citations — patches, advisories, analysis.

scry

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