How severe is CVE-2011-4499?

CVE-2011-4499 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2011-4499 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4499?

CVE-2011-4499 primarily affects Cisco Linksys Wrt54g Router Firmware. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-4499?

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-2011-4499 published?

CVE-2011-4499 was published on 2011-11-22 and last updated on 2026-06-16.

CVE-2011-4499

CVE-2011-4499 is a high-severity vulnerability in Cisco Linksys Wrt54g Router Firmware 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: 1% (67th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-16
Affected product: Cisco Linksys Wrt54g Router Firmware
Published: 2011-11-22
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2011-4499?: 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.
How severe is CVE-2011-4499?: CVE-2011-4499 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2011-4499 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4499?: CVE-2011-4499 primarily affects Cisco Linksys Wrt54g Router Firmware. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-4499?: 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-2011-4499 published?: CVE-2011-4499 was published on 2011-11-22 and last updated on 2026-06-16.

References

Affected products (11)

cpe:2.3:a:cisco:linksys_wrt54g_router_firmware:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:linksys_wrt54g_router_firmware:3.03.9:*:*:*:*:*:*:*
cpe:2.3:a:cisco:linksys_wrt54g_router_firmware:4.20.7:*:*:*:*:*:*:*
cpe:2.3:h:linksys:wrt54g:*:*:*:*:*:*:*:*
cpe:2.3:h:linksys:wrt54g:2.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:linksys_wrt54gs_router_firmware:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:linksys_wrt54gs_router_firmware:2.09.1:*:*:*:*:*:*:*
cpe:2.3:h:linksys:wrt54gs:1.0:*:*:*:*:*:*:*
cpe:2.3:h:linksys:wrt54gs:2.0:*:*:*:*:*:*:*
cpe:2.3:h:linksys:wrt54gs:3.0:*:*:*:*:*:*:*
cpe:2.3:h:linksys:wrt54gs:4.0:*:*:*:*:*:*:*

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