What is CVE-2015-3306?
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 record classifies CVE-2015-3306 under weakness class CWE-284. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. The identifier was first published 4163 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 10 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H - EPSS (FIRST)
- 98.0% probability of exploitation in the next 30 days, higher than 99.9% of all scored CVEs
- CISA KEV
- Listed since 2026-10-08, federal remediation deadline 2026-10-11
- Threadlinqs priority
- 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- Published
- 2015-05-18, last modified 2026-10-09
Is CVE-2015-3306 being exploited?
CISA added CVE-2015-3306 to the Known Exploited Vulnerabilities catalog on 2026-10-08, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-10-11 under BOD 22-01. Weaponised exploit code for CVE-2015-3306 is publicly available. 11 public proof-of-concept repositories are tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (network/cves/2015/CVE-2015-3306.yaml). It currently carries a trending score of 50 in the Threadlinqs vulnerability feed.
- t0kx/exploit-CVE-2015-3306 (github)
- nootropics/propane (github)
- xyk0x/cpx_proftpd (github)
- davidtavarez/CVE-2015-3306 (github)
- cd6629/CVE-2015-3306-Python-PoC (github)
- 0xm4ud/ProFTPD_CVE-2015-3306 (github)
- jptr218/proftpd_bypass (github)
- cybersensei-EH/hackviser_labs_CVE-2015-3306 (github)
Affected products and versions
No affected-product or package list has been recorded for CVE-2015-3306 in the tracked sources. The vendor advisory and the references below are the authoritative statement of what is affected.
How to fix CVE-2015-3306
Because CVE-2015-3306 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-10-11. No vendor patch reference has been recorded for CVE-2015-3306 in the tracked sources. Follow the references below for a fix, and treat any affected deployment as exposed until the vendor states otherwise.
Threat activity tracking CVE-2015-3306
1 tracked threat in the Threadlinqs corpus references CVE-2015-3306, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories, ProjectDiscovery Nuclei. Last verified by Threadlinqs on .
Vendor advisory and patch
- debian.org — vendor advisory
- lists.opensuse.org — vendor advisory
- lists.fedoraproject.org — vendor advisory
- lists.fedoraproject.org — vendor advisory (157054)
- lists.fedoraproject.org — vendor advisory (157581)
Exploit and proof of concept
Vulnerability database entry
Other references
- rapid7.com
- packetstormsecurity.com
- packetstormsecurity.com (ProFTPd CPFR CPTO Proof Of Concept)
- packetstormsecurity.com (ProFTPD 1.3.5 Mod Copy Command Execution)
- packetstormsecurity.com (ProFTPd 1.3.5 File Copy)
Showing 13 of 14 recorded references.