CVE-2024-42059: Zyxel Zld

High severity, CVSS 7.2. EPSS: 1.3% chance of exploitation in the next 30 days.

A post-authentication command injection vulnerability in Zyxel ATP series firmware versions from V5.00 through V5.38, USG FLEX series firmware versions from V5.00 through V5.38, USG FLEX 50(W) series firmware versions from V5.00 through V5.38, and USG20(W)-VPN series firmware versions from V5.00 through V5.38 could allow an authenticated attacker with administrator privileges to execute some OS commands on an affected device by uploading a crafted compressed language file via FTP.

Affected products

• Zyxel Zld: from 5.00, before 5.39 (fixed in 5.39)

Published 2024-09-03. Last modified 2026-06-17.