How severe is CVE-2015-3306?

No CVSS score has been assigned to CVE-2015-3306 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2015-3306?

Affected package information for CVE-2015-3306 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2015-3306?

No fixed release is recorded for CVE-2015-3306 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.

How do I detect CVE-2015-3306 in my code and dependencies?

Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

How do I mitigate CVE-2015-3306 if there is no patch (or I can't update yet)?

Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Is CVE-2015-3306 actively exploited in the wild?

Yes. There are 12 known exploit references for CVE-2015-3306, including 4 documented proof-of-concept exploits on Exploit-DB and 6 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

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

CVE-2015-3306 has an EPSS (Exploit Prediction Scoring System) score of 99.5%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2015-3306 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2015-3306 (ProFTPD Improper Access Control Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-10-08. CISA required all US federal civilian agencies to remediate this vulnerability by 2026-10-11. The required action was: 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. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2015-3306?

CVE-2015-3306 is classified as CWE-284 (CWE-284). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2015-3306 published, and has it been updated?

CVE-2015-3306 was published on May 18, 2015 and was last updated on April 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV · ACTIVELY EXPLOITED

CVE-2015-3306

CVE-2015-3306 is a CWE-284 vulnerability. It is in CISA's Known Exploited Vulnerabilities catalog (added 2026-10-08) — treat it as actively exploited and patch now. No vendor fix is recorded yet; mitigation options are listed below.

Published

May 18, 2015

Updated

Apr 10, 2026

Affected

5 products

Patched

See advisory

Exploits

12 known

Exploitation data as of Oct 24, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2026-10-08. Federal agencies were required to remediate by 2026-10-11.
CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
A successful exploit gives an attacker total control of the affected component, not partial access.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2015-3306.

EPSS Exploitation Probability

via FIRST.org ↗

99.5%probability of exploitation in next 30 days

Very High Risk+2.74%

Lower risk than most CVEs100th percentile — riskier than 100% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

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 Products

5 products · 10 configurations

debian linuxdebian

3 versions

7.08.09.0

fedorafedoraproject

3 versions

202122

tumbleweedopensuse

all

Application

proftpdproftpd

1 version

1.3.5

linux enterprise serversuse

1 version

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-49908remotelinux✓ Verified

ProFTPd 1.3.5 - 'mod_copy' Remote Command Execution (2)

by Shellbr3ak · May 26, 2021

Exploit-DB Source

EDB-36742remotelinux✓ Verified

ProFTPd 1.3.5 - File Copy

by anonymous · Apr 13, 2015

Exploit-DB Source

EDB-37262remotelinux✓ Verified

ProFTPd 1.3.5 - 'mod_copy' Command Execution (Metasploit)

by Metasploit · Jun 10, 2015

Exploit-DB Source

EDB-36803remotelinux

ProFTPd 1.3.5 - 'mod_copy' Remote Command Execution

by R-73eN · Apr 21, 2015

Exploit-DB Source

Detection & mitigation playbook

Vulnerability

Detect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Remediation status
No fixed release is recorded for CVE-2015-3306 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.
Mitigate without a patch
Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

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.

O3 Security · Impact-Aware SCA

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CVE-2015-3306

Exploitation Status

Actively exploited in the wild

EPSS Exploitation Probability

Description

Affected Products

Detection & mitigation playbook

Detect

Remediation status

Mitigate without a patch

Frequently Asked Questions

Is CVE-2015-3306 in your dependencies?