Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2015-3306

Proftpd

Proftpd

Watch CVE-2015-3306 Browse KEV feed
Severity
CVSS 10.0 · Critical
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
96.8%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2015-3306 is an unauthenticated vulnerability affecting Proftpd. 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.

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is confirmed. Listed in CISA KEV.

Who is affected?

Proftpd.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Proftpd

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.

View vendor advisory (opens in new tab)
Published
18 May 2015
Exploitation Reported
08 Oct 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

cisa

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 08 Oct 2026

A trusted third party reported exploitation.

Proof of concept available

GitHub

Recorded 08 Jan 2017

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
CISA First 2026-10-08 17:40 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Metasploit https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/unix/ftp/proftpd_modcopy_exec.rb 28 Apr 2025
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/network/cves/2015/CVE-2015-3306.yaml 25 Apr 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

10.0 Critical

Potential damage if exploited. Separate from whether attackers are using it.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS

96.8%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Improper Access Control CWE-284

Recent mention · TheRegister

US disrupts Chinese hacking tools as 7 govts warn of PRC spies stealing sensitive data worldwide

Infecting devices from 2021 until the FBI stepped in

Read full advisory

All CVSS Scores

CVSS v3.1 10.0 Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS v2.0 10.0 High

AV:N/AC:L/Au:N/C:C/I:C/A:C

All Mentions

Recent mention · TheRegister

US disrupts Chinese hacking tools as 7 govts warn of PRC spies stealing sensitive data worldwide

TheRegister · 08 Oct 2026

Infecting devices from 2021 until the FBI stepped in

Recent mention · The Hacker News

FBI Says China-Linked Hackers Ran Portal Giving Third Parties Access to Stolen Emails

The Hacker News · 08 Oct 2026

Swati KhandelwalOct 08, 2026Data Breach / Cyber Espionage Hackers tied to a Chinese cybersecurity company stole email from government organizations, law enforcement agencies, healthcare systems, and religious institutions in Southeast Asia, the FBI and agencies in 6 other countries said on October 8. The company, Integrity Technology Group, has been sanctioned by the U.S. and the UK. The hackers scanned websites for flaws using a tool containing more than 1,300 scripts, guessed passwords for Microsoft 365 and Exchange accounts, and copied mailboxes using tools designed to collect mail....

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

36742

cve · Created Unknown

36803

cve · Created Unknown

proftpd_modcopy_exec

metasploit · Created Unknown

Metasploit module for CVE-2015-3306

ProFTPd - Remote Code Execution

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

  1. 17:40 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  2. 15:02 UTC

    Metasploit module available

    Exploit module available

  3. 15:02 UTC

    Public PoC available

    Public proof-of-concept code published

  4. 00:00 UTC

    Nuclei template available

    Scanner coverage available

  5. 15:00 UTC

    CVE published

    Vulnerability disclosed publicly

  6. 00:00 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2015-3306

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2015-3306",
  "confidence": "Confirmed",
  "cvss_score": 10.0,
  "cvss_estimated": false,
  "epss_score": 0.96752,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}