CVE-2024-42057

highpriority · track · 0EPSS 0.013 · 71 %ileDEEUNLRUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.32% (71st) EPSS

CVSS 8.1 · high

Is it mine?

17 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

A command injection vulnerability in the IPSec VPN feature of Zyxel ATP series firmware versions from V4.32 through V5.38, USG FLEX series firmware versions from V4.50 through V5.38, USG FLEX 50(W) series firmware versions from V4.16 through V5.38, and USG20(W)-VPN series firmware versions from V4.16 through V5.38 could allow an unauthenticated attacker to execute some OS commands on an affected device by sending a crafted username to the vulnerable device. Note that this attack could be successful only if the device was configured in User-Based-PSK authentication mode and a valid user with a long username exceeding 28 characters exists.

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:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

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

v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · security@zyxel.com.twexploitability 2.2 · impact 5.9

v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Hsecondary · CVSS-BT (t0sche)

v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · NCSC-NL NL

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-78USCWE-78US

affected products (17)

Products and version ranges known to be affected.

Zyxel Firewall <5.39all versionscert_bundDE
Zyxel Firewall< 5.39cert_bundDE
Zyxel ATP series firmware≤ versions V4.32 through V5.38enisa_euvdEU
Zyxel USG FLEX 50(W) series firmware≤ versions V4.16 through V5.38enisa_euvdEU
Zyxel USG FLEX series firmware≤ versions V4.50 through V5.38enisa_euvdEU
Zyxel USG20(W)-VPN series firmware≤ versions V4.16 through V5.38enisa_euvdEU
Zyxel Communications Corp. ATP4.32 → 5.39fstec_bduRU
Zyxel Communications Corp. USG FLEX4.50 → 5.39fstec_bduRU
Zyxel Communications Corp. USG FLEX 50(W)4.16 → 5.39fstec_bduRU
Zyxel Communications Corp. USG USG20(W)-VPN4.16 → 5.39fstec_bduRU
atp_series_firmwareall versionsncsc_nlNLcpe:2.3:a:zyxel:atp_series_firmware:versions_v4.32_through_v5.38:*:*:*:*:*:*:*
usg20_w_-vpn_series_firmwareall versionsncsc_nlNLcpe:2.3:a:zyxel:usg20_w_-vpn_series_firmware:versions_v4.16_through_v5.38:*:*:*:*:*:*:*
usg_flex_50_w__series_firmwareall versionsncsc_nlNLcpe:2.3:a:zyxel:usg_flex_50_w__series_firmware:versions_v4.16_through_v5.38:*:*:*:*:*:*:*
usg_flex_series_firmwareall versionsncsc_nlNLcpe:2.3:a:zyxel:usg_flex_series_firmware:versions_v4.50_through_v5.38:*:*:*:*:*:*:*
zyxel zld4.16 → 5.39nvdUScpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:*
zyxel zld4.32 → 5.39nvdUScpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:*
zyxel zld4.50 → 5.39nvdUScpe:2.3:o:zyxel:zld:*:*:*:*:*:*:*:*

advisories (2)

Vendor and ecosystem advisories describing this.

NCSC-2024-0357Kwetsbaarheden verholpen in Zyxel Flex en USG FirewallsNL2024-09-03csaf · ncsc_nlNL
Zyxel heeft kwetsbaarheden verholpen in de firmware van ATP en USG Flex firewalls.
WID-SEC-W-2024-2031Zyxel Firewall: Mehrere SchwachstellenDeutsch2024-09-02csaf · cert_bundDE
Ein entfernter Angreifer kann mehrere Schwachstellen in der Zyxel Firewall ausnutzen, um beliebigen Code auszuführen, einen Denial-of-Service-Zustand zu erzeugen oder Cross-Stie Scripting-Angriffe durchzuführen.

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 ncsc_nl nvd NVD CVE.org MITRE

published 2024-09-03modified 2026-06-17

references (4)

External citations — patches, advisories, analysis.

scry

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