CVE-2011-4503

Name: CVE-2011-4503
Creator: NVD / NIST
Published: 2011-11-22T11:55:05.967+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.22%

Last modified Jun 16, 2026

CVE-2011-4503 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 2.22% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability

2.22%

80.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-16

Affected Software

Vendor	Product	Versions
Broadcom	Broadcom Linux	All versions
Sitecom	Wl-111	All versions

References

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

Timeline

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

Frequently Asked Questions

What is CVE-2011-4503?

How severe is CVE-2011-4503?

Severity scoring for CVE-2011-4503 is pending analysis. The EPSS model estimates a 2.22% probability of exploitation in the next 30 days.

How do I fix CVE-2011-4503?

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-2011-4503?

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

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Source: NVD / NIST