Is CVE-2015-3306 being actively exploited?

Yes. CVE-2015-3306 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added on October 8, 2026.

What is the CVSS score for CVE-2015-3306?

CVE-2015-3306 has a CVSS 3.1 base score of 10.0 (CRITICAL).

CVE-2015-3306

CRITICAL · CVSS 10.0CISA KEV: actively exploitedEPSS 99.5%EU EUVD: exploited

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.

Key facts

CVSS score: 10.0 (v3.1)
Severity: CRITICAL
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-284
EPSS score: 99.5% (100th percentile)
In CISA KEV: Yes, added October 8, 2026
In EU EUVD: Yes (EUVD-2015-3352)
Published: May 18, 2015
NVD last modified: October 9, 2026
Status: Analyzed

CISA Known Exploited Vulnerability

ProFTPD Improper Access Control Vulnerability

Added to the KEV catalog on October 8, 2026; federal remediation due October 11, 2026.

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2015-3352 in the EU Vulnerability Database. ENISA flags it as known exploited. Last updated in EUVD on October 9, 2026.

View on the EU Vulnerability Database

Affected products

debian / debian linux
debian / debian linux
debian / debian linux
fedoraproject / fedora
fedoraproject / fedora
fedoraproject / fedora
opensuse / tumbleweed
proftpd / proftpd
suse / linux enterprise server
suse / linux enterprise server

Certified products that may be affected

6 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

SUSE Linux Enterprise Server, Version 15 SP7 - SUSE LLC - Common Criteria BSI-DSZ-CC-1230-2026 - active
SUSE Linux Enterprise Server 15, SP4 - SUSE Software Solutions Germany GmbH - Common Criteria BSI-DSZ-CC-1248-2026 - active
SUSE Linux Enterprise Server, Version 15 SP4 - SUSE LLC - Common Criteria BSI-DSZ-CC-1231-2026 - active
SUSE Linux Enterprise Server 15 SP4 - SUSE LLC - Common Criteria BSI-DSZ-CC-1213-2023 - active
SUSE Linux Enterprise Server Version 15 SP2 - SUSE LLC - Common Criteria BSI-DSZ-CC-1168-2021 - active

See all 6 in the Security Certifications Explorer.

References

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.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2015-3306(US Government Resource)
https://www.exploit-db.com/exploits/36742/(Exploit)
https://www.exploit-db.com/exploits/36803/(Exploit)

Last updated October 11, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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