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CVE-2015-3306

CRITICAL
10
CVSS Score
Published: May 18, 2015 at 03:00 PM UTC
Updated: October 9, 2026 at 04:17 PM UTC
5 products affected across 5 vendorsDebian LinuxFedoraLinux Enterprise Server

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Severity
CRITICAL10
Exploitation
CISA KEV
Exploit prediction
EPSS 99%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score99.5%

EPSS (Exploit Prediction Scoring System) estimates a 99.5% chance this CVE is exploited in the wild within the next 30 days — higher than 100% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

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.

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.
Ransomware Use
Unknown
Added to KEV
Oct 8, 2026
Remediation Due
Oct 11, 2026
16 days overdue
Notes
This vulnerability could affect an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: http://www.proftpd.org/
https://lists.debian.org/debian-security-announce/2015/msg00154.html
https://lists.opensuse.org/archives/list/[email protected]/message/WE6YZRG5UVXMGQ7IVDRYBPIWV4M6UUGM/
BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
https://nvd.nist.gov/vuln/detail/CVE-2015-3306

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

References (15)

Vendor Advisoryx_refsource_FEDORABroken LinkMailing ListThird Party Advisory
Source: [email protected]
http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157053.html
Vendor Advisoryx_refsource_FEDORABroken LinkMailing ListThird Party Advisory
Source: [email protected]
http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157054.html
Vendor Advisoryx_refsource_FEDORABroken LinkMailing ListThird Party Advisory
Source: [email protected]
http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157581.html
Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
Source: [email protected]
http://lists.opensuse.org/opensuse-updates/2015-06/msg00020.html
x_refsource_MISCThird Party AdvisoryVDB Entry
Source: [email protected]
http://packetstormsecurity.com/files/131505/ProFTPd-1.3.5-File-Copy.html
x_refsource_MISCThird Party AdvisoryVDB Entry
Source: [email protected]
http://packetstormsecurity.com/files/131555/ProFTPd-1.3.5-Remote-Command-Execution.html
x_refsource_MISCExploitVDB Entry
Source: [email protected]
http://packetstormsecurity.com/files/131567/ProFTPd-CPFR-CPTO-Proof-Of-Concept.html
x_refsource_MISCExploitVDB Entry
Source: [email protected]
http://packetstormsecurity.com/files/132218/ProFTPD-1.3.5-Mod_Copy-Command-Execution.html

SSVC — Action Prioritization

SSVCActiveAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

10CRITICALCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-284

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