CVEs / CVE-2015-3306
CVE-2015-3306: ProFTPD Improper Access Control Vulnerability
- Known exploited in the CISA KEV catalog since 8 Oct 2026
- high 10 CVSS 2.0 (NVD)
- EPSS 99.4% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
- Last changed at its sources
Are you affected? Check your servers with Stackurity: it lists the software on each server and the vulnerabilities to fix first.
Check your servers with Stackurity Already using Stackurity? Search for CVE-2015-3306
Summary
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.
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.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| n/a n/a | n/a | — |
Exploitation
| In CISA KEV since | 8 Oct 2026 |
|---|---|
| Due date for US federal agencies | 11 Oct 2026 |
| Used in ransomware campaigns | Unknown |
| 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. |
Severity
| CVSS 2.0 | 10 highAV:N/AC:L/Au:N/C:C/I:C/A:CScored by NVD |
|---|---|
| Weakness | CWE-284 |
On the Stackurity blog
References
- CVE-2015-3306 on NVD
- CVE-2015-3306 in the CISA KEV catalog
- http://www.proftpd.org/ (cited by CISA)
- https://lists.debian.org/debian-security-announce/2015/msg00154.html (cited by CISA)
- https://lists.opensuse.org/archives/list/[email protected]/message/WE6YZRG5UVXMGQ7IVDRYBPIWV4M6UUGM/ (cited by CISA)
- https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk (cited by CISA)
- https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk (cited by CISA)
- CVE-2015-3306 on OSV
- http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157053.html Broken Link, Mailing List, Third Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157054.html Broken Link, Mailing List, Third Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157581.html Broken Link, Mailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-updates/2015-06/msg00020.html Mailing List, Third Party Advisory
- http://packetstormsecurity.com/files/131505/ProFTPd-1.3.5-File-Copy.html Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/131555/ProFTPd-1.3.5-Remote-Command-Execution.html Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/131567/ProFTPd-CPFR-CPTO-Proof-Of-Concept.html Exploit, VDB Entry
- http://packetstormsecurity.com/files/132218/ProFTPD-1.3.5-Mod_Copy-Command-Execution.html Exploit, VDB Entry
- http://packetstormsecurity.com/files/162777/ProFTPd-1.3.5-Remote-Command-Execution.html Exploit, VDB Entry
- http://www.debian.org/security/2015/dsa-3263 Mailing List, Third Party Advisory
- http://www.rapid7.com/db/modules/exploit/unix/ftp/proftpd_modcopy_exec Third Party Advisory
- http://www.securityfocus.com/bid/74238 Third Party Advisory
- https://www.exploit-db.com/exploits/36742/ Exploit
- https://www.exploit-db.com/exploits/36803/ Exploit
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2015-3306 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.