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Actively exploited · Published May 18, 2015 · Assigned by mitre

CVE-2015-3306

Critical 10.0 Exploited

In plain English

A critical-severity improper access control in ProFTPD from ProFTPD. Attackers are actively exploiting it in the wild (listed by CISA on October 8, 2026). The chance it is exploited in the next 30 days is estimated at 99.5% (higher than 99.9% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit, Nuclei, public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)10.0Critical
Exploit odds (30 days)99.5%top 0.1% of all CVEs
Exploited in the wildYesCISA KEV since Oct 8, 2026
Attack tooling3Metasploit, Nuclei, Public PoC

CISA guidance

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.

Federal agencies must remediate by Oct 11, 2026.

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12proftpd-dfsg1.3.5-2DEBIAN-CVE-2015-3306
Debian:13proftpd-dfsg1.3.5-2DEBIAN-CVE-2015-3306
Debian:14proftpd-dfsg1.3.5-2DEBIAN-CVE-2015-3306

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

Weakness: CWE-284 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References