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

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HIGH

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

Published Nov 22, 2011

7.5

HIGH

CVSS 2.0

EPSS 2.09%

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.

Affected products

Remediation

No remediation recorded yet.

Metrics

2.09% 0.02094

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.02094

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (12 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	2.09% (0.02094)	80.96th	v5 (v2026.06.15)
Jun 15, 2026	2.22% (0.02216)	80.27th	v5 (v2026.06.15)
Mar 17, 2025	0.44% (0.00441)	61.08th	v4 (v2025.03.14)
Dec 12, 2024	0.49% (0.00493)	76.96th	v3 (v2023.03.01)
May 10, 2024	0.40% (0.00395)	73.30th	v3 (v2023.03.01)
Mar 15, 2024	0.37% (0.00374)	72.15th	v3 (v2023.03.01)
Feb 8, 2024	0.36% (0.00356)	71.27th	v3 (v2023.03.01)
Mar 7, 2023	0.49% (0.00493)	72.48th	v3 (v2023.03.01)
Mar 6, 2023	1.05% (0.01055)	52.13th	v2 (v2022.01.01)
Sep 17, 2022	1.05% (0.01055)	50.47th	v2 (v2022.01.01)
Apr 1, 2022	1.05% (0.01055)	48.43th	v2 (v2022.01.01)
Feb 4, 2022	1.05% (0.01055)	27.52th	v2 (v2022.01.01)

Weaknesses (1)

CWE-16

References (2)

http://www.kb.cert.org/vuls/id/357851
third-party-advisoryx_refsource_CERT-VNUS Government Resource
http://www.upnp-hacks.org/suspect.html
x_refsource_MISC

Link	Providers	Tags
http://www.kb.cert.org/vuls/id/357851		third-party-advisoryx_refsource_CERT-VNUS Government Resource
http://www.upnp-hacks.org/suspect.html		x_refsource_MISC

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner mitre

Published Nov 22, 2011

Updated Sep 16, 2024

Reserved Nov 22, 2011

Link CVE-2011-4503

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 16, 2026

Link CVE-2011-4503

Red Hat

Severity n/a

Public date n/a

Links CVE-2011-4503