CVE-2023-6398

highpriority · track · 0EPSS 0.013 · 71 %ileDEEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.33% (71st) EPSS

CVSS 7.2 · high

Is it mine?

97 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

A post-authentication command injection vulnerability in the file upload binary in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1, USG FLEX series firmware versions from 4.50 through 5.37 Patch 1, USG FLEX 50(W) series firmware versions from 4.16 through 5.37 Patch 1, USG20(W)-VPN series firmware versions from 4.16 through 5.37 Patch 1, USG FLEX H series firmware versions from 1.10 through 1.10 Patch 1, NWA50AX firmware versions through 6.29(ABYW.3), WAC500 firmware versions through 6.65(ABVS.1), WAX300H firmware versions through 6.60(ACHF.1), and WBE660S firmware versions through 6.65(ACGG.1) could allow an authenticated attacker with administrator privileges to execute some operating system (OS) commands on an affected device via FTP.

cvss

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

7.2

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.6–7.2

v3.17.2highAV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.17.2highCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.17.2highCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Hsecondary · security@zyxel.com.twexploitability 1.2 · impact 5.9

v3.16.6mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/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-78USCWE-78US

affected products (97)

Products and version ranges known to be affected.

Zyxel ATP series firmware≤ version 4.32 through 5.37 Patch 1enisa_euvdEU
Zyxel NWA50AX firmware≤ < 6.29(ABYW.4)enisa_euvdEU
Zyxel USG FLEX 50(W) series firmware≤ version 4.16 through 5.37 Patch 1enisa_euvdEU
Zyxel USG FLEX H series firmware≤ version 1.10 through 1.10 Patch 1enisa_euvdEU
Zyxel USG FLEX series firmware≤ version 4.50 through 5.37 Patch 1enisa_euvdEU
Zyxel USG20(W)-VPN series firmware≤ version 4.16 through 5.37 Patch 1enisa_euvdEU
Zyxel WAC500 firmware≤ < 6.70(ABVS.1)enisa_euvdEU
Zyxel WAX300H firmware≤ < 6.70(ACHF.1)enisa_euvdEU
Zyxel WBE660S firmware≤ < 6.70(ACGG.1)enisa_euvdEU
Zyxel Communications Corp. ATP4.32 → 5.37 Patch 1fstec_bduRU
Zyxel Communications Corp. USG 20(W)-VPN4.16 → 5.37 Patch 1fstec_bduRU
Zyxel Communications Corp. USG FLEX4.50 → 5.37 Patch 1fstec_bduRU
Zyxel Communications Corp. USG FLEX 50(W)4.16 → 5.37 Patch 1fstec_bduRU
Zyxel Communications Corp. USG FLEX H1.10 → 1.10 Patch 1fstec_bduRU
Zyxel Communications Corp. ZYXEL NWA110AX≤ 6.65(ABTG.1)fstec_bduRU
Zyxel Communications Corp. ZYXEL NWA1123ACv3≤ 6.65(ABVT.1)fstec_bduRU
Zyxel Communications Corp. ZYXEL NWA210AX≤ 6.65(ABTD.1)fstec_bduRU
Zyxel Communications Corp. ZYXEL NWA220AX-6E≤ 6.65(ACCO.1)fstec_bduRU
Zyxel Communications Corp. ZYXEL NWA50AX≤ 6.29(ABYW.3)fstec_bduRU
Zyxel Communications Corp. ZYXEL NWA50AX-PRO≤ 6.65(ACGE.1)fstec_bduRU

showing 20 of 97

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2024-0421Zyxel Firewall: Mehrere SchwachstellenDeutsch2024-02-19csaf · cert_bundDE
Ein entfernter Angreifer kann mehrere Schwachstellen in Zyxel Firewall ausnutzen, um einen Denial-of-Service-Zustand zu erzeugen oder beliebigen Code auszuführen.

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 CVE.org MITRE

published 2024-02-20modified 2026-06-17

references (4)

External citations — patches, advisories, analysis.

scry

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