CVE-2006-2562: Zyxel P-335wt Router

High severity, CVSS 7.5. EPSS: 1.5% chance of exploitation in the next 30 days.

ZyXEL P-335WT router allows remote attackers to bypass access restrictions and conduct unauthorized operations via a UPnP request with a modified InternalClient parameter, which is not validated, as demonstrated by using AddPortMapping to forward arbitrary traffic.

Affected products

• Zyxel P-335wt Router: any version

Published 2006-05-24. Last modified 2026-06-16.