CVE-2015-3306 Exploited in the wild

ProFTPD Improper Access Control Vulnerability

Risk score: 100/100
CVSS: 10.0 v3.1
Exploit chance (30 days): 99.5%
Published: 18 May 2015
Added to CISA's exploited list: 8 Oct 2026

Open in the live forecast Today's forecast

What to know

What it is: ProFTPD 1.3.5 has a vulnerability in the mod_copy module, allowing remote attackers to read and write to arbitrary files via the site cpfr and site cpto commands. An attacker could exploit this to gain high impact access.
Affected: {'product': 'ProFTPD', 'version': '1.3.5'}
Fix: Apply mitigations in accordance with vendor instructions
Exploitation: Exploited in the wild

Why it is Red

CVSS 10.0 critical
Exploitation likely: EPSS 99.5% (top 1%)
Exploited in the wild (CISA KEV)
Public exploit or proof of concept referenced
Remotely exploitable without logging in

CISA required action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

References

Original 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.

Last activity 8 Oct 2026. Patch Forecast updates every hour.