FalehSec Exploited-vulnerability triage · joined from CISA KEV, NVD CVSS and EPSS
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CVE-2015-3306

ProFTPD · ProFTPD · ProFTPD Improper Access Control Vulnerability

Verdict
Patch soon · actively exploited, not reachable unauthenticated from the internet, and in the top 1% of CVEs by near-term exploitation probability

Added to CISA KEV 2026-10-08 · exploited in the wild for 1 day

How a test catches it

Test
Request the protected path directly, bypassing the component meant to enforce the policy.
Passes when
The resource refuses the direct request, not only the mediated one. A control that only holds when reached the intended way is not a control.
What an attacker can reach How likely Time What CISA says to do Sources All 550

What an attacker can reach

CVSS 10.0 . The score is a summary; these three components are the part that decides whether something scanning the internet can use it.

Base vectorAV:N/AC:L/Au:N/C:C/I:C/A:C
WeaknessCWE-284

This describes the vulnerability. It says nothing about whether your systems run it.

How likely

EPSS puts the probability of exploitation in the next 30 days at 0.9675, which places it in the top 1% of all tracked CVEs. The percentile is the more useful half: 0.18 in absolute terms sounds low until you know most of the internet-facing software in the world scores under that.

EPSS probability0.9675
Percentile0.999 — top 1%

Time

Added to KEV2026-10-08
Days exploited1
Federal remediation duenot set
Ransomware useno known ransomware campaign use

What CISA says to do

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.

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.

Sources

This page describes the bug, not your estate. It cannot tell you whether you run it, or whether your own systems carry the same class of flaw. That question is what an assessment answers.

Web application penetration testing · API security testing · every service