CVE-2022-43972: Linksys WRT54GL Firmware

High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days.

A null pointer dereference vulnerability exists in Linksys WRT54GL Wireless-G Broadband Router with firmware <= 4.30.18.006. A null pointer dereference in the soap_action function within the upnp binary can be triggered by an unauthenticated attacker via a malicious POST request invoking the AddPortMapping action.

Affected products

• Linksys WRT54GL Firmware: up to and including 4.30.18.006

Published 2023-01-09. Last modified 2026-06-17.