CVE-2011-4499

Severity: high (CVSS 7.5 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2011-11-22 · updated 2026-06-16
Weakness: CWE-16

Description

The UPnP IGD implementation in the Broadcom UPnP stack on the Cisco Linksys WRT54G with firmware before 4.30.5, WRT54GS v1 through v3 with firmware before 4.71.1, and WRT54GS v4 with firmware before 1.06.1 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

Cisco Linksys Wrt54G Router Firmware: through 4.20.8; 3.03.9, 4.20.7
Cisco Linksys Wrt54Gs Router Firmware: through 4.70.6; through 1.06; 2.09.1
Linksys Wrt54G: 2.2
Linksys Wrt54Gs: 1.0, 2.0, 3.0, 4.0

References

http://www.kb.cert.org/vuls/id/357851
http://www.upnp-hacks.org/devices.html
http://www.kb.cert.org/vuls/id/357851
http://www.upnp-hacks.org/devices.html

Get alerted when CVE-2011-4499 or the next vulnerability affects your stack