How severe is CVE-2011-4503?

CVE-2011-4503 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2011-4503 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4503?

CVE-2011-4503 primarily affects Broadcom Broadcom Linux. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-4503?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2011-4503 published?

CVE-2011-4503 was published on 2011-11-22 and last updated on 2026-06-16.

CVE-2011-4503

CVE-2011-4503 is a high-severity vulnerability in Broadcom Broadcom Linux with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-16.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-16
Affected product: Broadcom Broadcom Linux
Published: 2011-11-22
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2011-4503?: 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.
How severe is CVE-2011-4503?: CVE-2011-4503 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2011-4503 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4503?: CVE-2011-4503 primarily affects Broadcom Broadcom Linux. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-4503?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2011-4503 published?: CVE-2011-4503 was published on 2011-11-22 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:o:broadcom:broadcom_linux:*:*:*:*:*:*:*:*
cpe:2.3:h:sitecom:wl-111:-:*:*:*:*:*:*:*

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