CVE-2024-11667: Zyxel Multiple Firewalls Path Traversal Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2024-12-03. EPSS: 2.9% chance of exploitation in the next 30 days.

A directory traversal vulnerability in the web management interface of Zyxel ATP series firmware versions V5.00 through V5.38, USG FLEX series firmware versions V5.00 through V5.38, USG FLEX 50(W) series firmware versions V5.10 through V5.38, and USG20(W)-VPN series firmware versions V5.10 through V5.38 could allow an attacker to download or upload files via a crafted URL.

Affected products

• Zyxel Zld: from 5.00, up to and including 5.38; from 5.10, up to and including 5.38

Published 2024-11-27. Last modified 2026-08-05.