Is itCheck something

No. CVE-2015-3306

Old ProFTPD file servers let attackers read and write files

Being used now

Yes. Attackers are using this right now.

Anyone running an older ProFTPD file transfer server.

What to do

Update ProFTPD to the latest version.

Confirmed in attacksOct 8, 2026
ProductProFTPD
GitHub repos13
Attack likelihood, next 30 daysover 99%

Attack likelihood is EPSS, a daily estimate from FIRST.org of how likely this bug is to be used in attacks in the next 30 days.

The official description

ProFTPD contains an improper access control vulnerability that could allow remote attackers to read and write to arbitrary files via the site cpfr and site cpto commands.

For your tech helper or AI assistant

A read-only checklist. Paste it into Claude, ChatGPT or a coding agent; it only looks and changes nothing.

Read-only check, change nothing, send nothing anywhere.
Is ProFTPD ProFTPD (CVE-2015-3306) installed or running on this machine or in this project?
1. Find every copy and its version (apps, packages, containers, lockfiles).
2. Compare each version against the vendor's fixed version for CVE-2015-3306. Quote the vendor page you used.
3. Report a table: where, version, fixed version, status (exposed / fixed / not installed / unsure).
4. List the exact update steps, but do not run them.
Download playbook (.md)

Code on GitHub

Repos named after this bug. Some are scanners or write-ups, some are working attack code. Do not run them on a machine you care about.

Sources