Quick answers
- Is CVE-2015-3306 exploited in the wild?
- Yes. CVE-2015-3306 is known to be exploited in the wild, first recorded on 8 October 2026. Treat it as urgent.
- How severe is CVE-2015-3306?
- Critical severity, published 8 October 2026.
- Which products and versions are affected?
- ProFTPD ProFTPD.
- Is there a fix for CVE-2015-3306?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2015-3306 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2015-3306?
- Check whether you run Proftpd. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
ProFTPD fails to properly validate access controls when processing SITE CPFR (copy from) and SITE CPTO (copy to) commands, allowing remote attackers to bypass intended file access restrictions. The vulnerability requires network access to an FTP server but no prior authentication. An attacker can exploit this to read arbitrary files from the system or write malicious files, achieving unauthorized information disclosure or system compromise.
Affected products
- ProFTPD ProFTPD
Timeline
- 2026-10-08: disclosed
- exploited: reported exploited in wild