CVE-2011-4499

Name: CVE-2011-4499
Creator: NVD / NIST
Published: 2011-11-22T11:55:04.683+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.43%

Last modified Jun 16, 2026

CVE-2011-4499 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 1.43% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

1.43%

69.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-16

Affected Software

Vendor	Product	Versions
Cisco	Linksys Wrt54g Router Firmware	<= 4.20.8
Cisco	Linksys Wrt54g Router Firmware	3.03.9
Cisco	Linksys Wrt54g Router Firmware	4.20.7
Linksys	Wrt54g	All versions
Linksys	Wrt54g	2.2
Cisco	Linksys Wrt54gs Router Firmware	<= 4.70.6
Cisco	Linksys Wrt54gs Router Firmware	2.09.1
Linksys	Wrt54gs	1.0
Linksys	Wrt54gs	2.0
Linksys	Wrt54gs	3.0
Cisco	Linksys Wrt54gs Router Firmware	<= 1.06
Linksys	Wrt54gs	4.0

References

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

Timeline

Published: Nov 22, 2011
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2011-4499?

How severe is CVE-2011-4499?

Severity scoring for CVE-2011-4499 is pending analysis. The EPSS model estimates a 1.43% probability of exploitation in the next 30 days.

How do I fix CVE-2011-4499?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2011-4499?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST