Is CVE-2011-4966 in the CISA KEV catalog?

No. CVE-2011-4966 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-4966?

CVE-2011-4966 has a CVSS v2 base score of 6.0 (MEDIUM).

What is the EPSS score for CVE-2011-4966?

CVE-2011-4966 has an EPSS score of 1.38% (69th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2011-4966?

Upgrade freeradius on debian 11 to 2.1.12+dfsg-1.2 or later.

CVE & CISA-KEV Catalog

CVE-2011-4966

MEDIUM

6.0

CVSS v2

NVD

Description

modules/rlm_unix/rlm_unix.c in FreeRADIUS before 2.2.0, when unix mode is enabled for user authentication, does not properly check the password expiration in /etc/shadow, which allows remote authenticated users to authenticate using an expired password.

CWE-255

How to fix

Remediation Available

freeradiusDebian

Fixed in:2.1.12+dfsg-1.2CVE-2011-4966

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

1.38%probability of exploitation in 30 days

69thpercentile

Moderate risk: more likely to be exploited than 69% of all known CVEs.

References

Patch1

rhn.redhat.com

Other references4

Related Vulnerabilities

Other CWE-255 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2010-0219	High	10.0	90%	-	-
CVE-2013-4786	High	7.5	82%	-	-
CVE-2014-9195	High	10.0	81%	-	-
CVE-2009-3548	High	7.5	79%	-	-
CVE-2009-4189	High	10.0	79%	-	-
CVE-2017-8229	Critical	9.8	74%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.