CVE-2024-42058: Zyxel Zld

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

A null pointer dereference vulnerability in 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 V5.20 through V5.38, and USG20(W)-VPN series firmware versions from V5.20 through V5.38 could allow an unauthenticated attacker to cause DoS conditions by sending crafted packets to a vulnerable device.

Affected products

• Zyxel Zld: from 4.32, before 5.39 (fixed in 5.39); from 4.50, before 5.39 (fixed in 5.39); from 4.20, before 5.39 (fixed in 5.39)

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