Skip to content
Fencer Intel
medium 6.0

CVE-2011-4966 json

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 pass…

published 2013-03-12 13 y ago modified 2026-06-16 4 mo ago also EUVD-2011-4872

cvss
6.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

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.

Patch / fix

  • freeradius Debian 14, Debian 13, Debian 12 2.1.12+dfsg-1.2

debian advisories DEBIAN-CVE-2011-4966

  • freeradius RHEL 6 2.1.12-3.el6
  • freeradius-krb5 RHEL 6 2.1.12-3.el6
  • freeradius-ldap RHEL 6 2.1.12-3.el6
  • freeradius-perl RHEL 6 2.1.12-3.el6
  • freeradius-mysql RHEL 6 2.1.12-3.el6
  • freeradius-utils RHEL 6 2.1.12-3.el6
  • freeradius-python RHEL 6 2.1.12-3.el6
  • freeradius-unixODBC RHEL 6 2.1.12-3.el6

red hat advisories RHBA-2012:0881RHSA-2013:0134

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2011-4966 updated cvss 2.1

freeradius: does not respect expired passwords when using the unix module

  • Red Hat Enterprise Linux 5 freeradius
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux (v. 5 server) freeradius2 2.1.12-5.el5, freeradius2-krb5 2.1.12-5.el5, freeradius2-ldap 2.1.12-5.el5, freeradius2-perl 2.1.12-5.el5, freeradius2-mysql 2.1.12-5.el5, freeradius2-utils 2.1.12-5.el5, +3 more Red Hat Enterprise Linux Desktop Workstation (v. 5 client) freeradius2 2.1.12-5.el5, freeradius2-krb5 2.1.12-5.el5, freeradius2-ldap 2.1.12-5.el5, freeradius2-perl 2.1.12-5.el5, freeradius2-mysql 2.1.12-5.el5, freeradius2-utils 2.1.12-5.el5, +3 more
    fixed: vendor fix RHSA-2013:0134
  • Red Hat Enterprise Linux Server (v. 6) freeradius 2.1.12-3.el6 Red Hat Enterprise Linux Server Optional (v. 6) freeradius 2.1.12-3.el6, freeradius-krb5 2.1.12-3.el6, freeradius-ldap 2.1.12-3.el6, freeradius-perl 2.1.12-3.el6, freeradius-mysql 2.1.12-3.el6, freeradius-utils 2.1.12-3.el6, +3 more Red Hat Enterprise Linux Workstation (v. 6) freeradius 2.1.12-3.el6 Red Hat Enterprise Linux Workstation Optional (v. 6) freeradius 2.1.12-3.el6, freeradius-krb5 2.1.12-3.el6, freeradius-ldap 2.1.12-3.el6, freeradius-perl 2.1.12-3.el6, freeradius-mysql 2.1.12-3.el6, freeradius-utils 2.1.12-3.el6, +3 more
    fixed: vendor fix RHBA-2012:0881

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.38% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 6.0 AV:N/AC:M/Au:S/C:P/I:P/A:P

Classification

Weakness
  • CWE-255 Credentials Management Errors

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.