How severe is CVE-2011-4500?

CVE-2011-4500 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2011-4500 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-2011-4500?

CVE-2011-4500 primarily affects Cisco Linksys Wrt54gx Router Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-4500?

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-2011-4500 published?

CVE-2011-4500 was published on 2011-11-22 and last updated on 2026-06-16.

CVE-2011-4500

CVE-2011-4500 is a high-severity vulnerability in Cisco Linksys Wrt54gx 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 Wrt54gx Router Firmware
Published: 2011-11-22
Last modified: 2026-06-16

Description

The UPnP IGD implementation on the Cisco Linksys WRT54GX with firmware 2.00.05, when UPnP is enabled, configures the SOAP server to listen on the WAN port, which allows remote attackers to administer the firewall via SOAP requests.

Frequently asked questions

What is CVE-2011-4500?: The UPnP IGD implementation on the Cisco Linksys WRT54GX with firmware 2.00.05, when UPnP is enabled, configures the SOAP server to listen on the WAN port, which allows remote attackers to administer the firewall via SOAP requests.
How severe is CVE-2011-4500?: CVE-2011-4500 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2011-4500 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-2011-4500?: CVE-2011-4500 primarily affects Cisco Linksys Wrt54gx Router Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-4500?: 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-2011-4500 published?: CVE-2011-4500 was published on 2011-11-22 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:cisco:linksys_wrt54gx_router_firmware:2.00.05:*:*:*:*:*:*:*
cpe:2.3:h:linksys:wrt54gx:2.0:*:*:*:*:*:*:*

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