CVE-2024-6343

MEDIUM

4.9

CVSS Score

Published: September 3, 2024 at 01:28 AM UTC

Updated: June 17, 2026 at 08:17 AM UTC

20 products affected across 1 vendorZldUsg Flex 200Usg Flex 500

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Severity

MEDIUM4.9

Exploit prediction

EPSS 0.6%

SSVC

No known exploit

Description

A buffer overflow vulnerability in the CGI program 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 authenticated attacker with administrator privileges to cause denial of service (DoS) conditions by sending a crafted HTTP request to a vulnerable device.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Zld · Zyxel

95%

4.16 ≤ v < 5.394.32 ≤ v < 5.394.50 ≤ v < 5.39

Affected range stops below 5.39, so it looks safe — our inference, not a vendor statement

zyxel-atp100 (environment) · zyxel-atp100w (environment) · zyxel-atp200 (environment) · zyxel-atp500 (environment) · zyxel-atp700 (environment) · zyxel-atp800 (environment) · zyxel-usg-20w-vpn (environment) · zyxel-usg-flex-100 (environment) · zyxel-usg-flex-100ax (environment) · zyxel-usg-flex-100w (environment) · zyxel-usg-flex-200 (environment) · zyxel-usg-flex-50 (environment) · zyxel-usg-flex-500 (environment) · zyxel-usg-flex-50w (environment) · zyxel-usg-flex-700 (environment)

ATP · Zyxel

60%

v ≤ 5.38

USG FLEX · Zyxel

60%

v ≤ 5.38

Usg Flex 50 · Zyxel

60%

v ≤ 5.38

Usg Flex 50W · Zyxel

60%

v ≤ 5.38