CVE-2015-3306

ProFTPD: Improper Access Control

As of , CVE-2015-3306 in ProFTPD is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch now.

Exploited
Yes: CISA listed it on 8 October 2026
US federal deadline
11 October 20263 days after CISA listed it. US federal civilian agencies must fix it by then.
Used in ransomware campaigns
Not known to CISA
Forensic triage
Required by CISA under BOD 26-04Agencies must also look for signs that attackers already got in.
EPSS score
0.99Higher than 99% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
EPSS when listed
0.97 on 8 October 2026EPSS on the day CISA listed it.
Public exploit
1 Metasploit module and 4 Exploit-DB entries (3 verified)
Fix
Vendor advice: lists.debian.org and lists.opensuse.orgLinks below, from CISA's entry.

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.

CISA's required action

What the flaw is

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.

CISA's 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.

The CVE record's description, from mitre

CVE published
18 May 2015
Assigned by
mitre
CVSS
10.0 Critical (CVSS 3.1, from CISA-ADP)
CWE-284
Improper Access Control
CISA SSVC, exploitation
active
CISA SSVC, automatable
yes
CISA SSVC, technical impact
total

EPSS since listing

0.250.500.750.50: the rank's Patch this week lineListed by CISA0.97 on 8 October 20260.99 since 10 October 2026
EPSS for CVE-2015-3306 since CISA listed it, on the days its value to 2 decimals changed. EPSS scores by FIRST.
Show the numbers
FromEPSS
0.97
0.98
0.99

Timeline

  1. Exploit-DB published an exploit (EDB-ID 36742).
  2. Exploit-DB published an exploit (EDB-ID 36803).
  3. The CVE record was published.
  4. Exploit-DB published an exploit (EDB-ID 37262).
  5. Exploit-DB published an exploit (EDB-ID 49908).
  6. CISA added it to its list of exploited vulnerabilities.
  7. The US federal deadline to fix it.

Public exploits

Facts from Metasploit's module list and Exploit-DB's index; we never copy exploit code.

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