CVE-2011-4503: Broadcom Linux

High severity, CVSS 7.5. EPSS: 2.1% chance of exploitation in the next 30 days.

The UPnP IGD implementation in Broadcom Linux on the Sitecom WL-111 allows remote attackers to establish arbitrary port mappings by sending a UPnP AddPortMapping action in a SOAP request to the WAN interface, related to an "external forwarding" vulnerability.

Affected products

• Broadcom Broadcom Linux: any version
• Sitecom Wl-111

Published 2011-11-22. Last modified 2026-06-16.