CVE WatchOct 9, 2026

CVE-2015-3306

ProFTPD Improper Access Control Vulnerability

CVSS

10.0

Critical

EPSS

99.5%

p100

KEV

YES

Oct 8, 2026

Exploit Today

0-100

Published: May 18, 2015 · Last modified: Oct 9, 2026 · CWE-284

EPSS · 30d

96.8%EPSS · 30 days99.5%

2026-09-162026-10-14

KEV catalog record

Product

ProFTPD / ProFTPD

Vulnerability

ProFTPD Improper Access Control Vulnerability

Added to KEV

Oct 8, 2026

Remediate by

Oct 11, 2026

Known ransomware use

Summary 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.

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.

Notes

This vulnerability could affect an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: http://www.proftpd.org/ ; https://lists.debian.org/debian-security-announce/2015/msg00154.html ; https://lists.opensuse.org/archives/list/updates@lists.opensuse.org/message/WE6YZRG5UVXMGQ7IVDRYBPIWV4M6UUGM/ ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2015-3306

Technical 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.

Official references

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