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Vulnerabilities/CVE-2015-3306Public Intelligence Dossier
Source: fedoraproject · Limited verification•Last verified: •Collection Degraded
CVE-2015-3306ListedCRITICAL (raw)CVSS 10.0CWE-284

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.

Published: 18 May 2015•Last updated: 09 Oct 2026, 09:47 PM IST•Source identifier: cve@mitre.org
Dossier completeness: source-provided sections 3 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Listed
Added08 Oct 2026
Due11 Oct 2026
RansomwareUnknown
CVSS score
10.0CRITICAL (raw)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Metric source134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS probability
—
Percentile—
Weakness type
CWE-284
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

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.

SOC priority

Immediate Attention

Actively exploited

Yes

Publicly disclosed

Unknown

Risk basis: CISA KEV exploitation signal; SOC ecosystem technology relevance; CRITICAL severity; Known exploitation signal from CISA KEV or ransomware metadata

Affected Products & Remediation

5 source-backed products
Affected products and versions (source)
  • fedoraproject fedora · 20; 21; 22 · NVD CPE · Source
  • debian debian linux · 7.0; 8.0; 9.0 · NVD CPE · Source
  • opensuse tumbleweed · version range not provided by source · NVD CPE · Source
  • suse linux enterprise server · 15 · NVD CPE · Source
  • proftpd proftpd · 1.3.5 · NVD CPE · Source
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

  • CISA KEV: 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.

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Listed
Exploited (source statement)
Yes
Publicly disclosed (source)
Unknown

CISA 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.

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched kev-network-exposure (CVSS AV:N, CISA KEV Listed); network-unauthenticated (CVSS AV:N, CVSS PR:N, CVSS UI:N)

Exposure

  1. Identify assets with the exact CVE and confirm the affected product/version against the advisory.Telemetry: DeviceTvmSoftwareVulnerabilities · KEV listing raises urgency, but inventory is needed to establish local exposure. · Rule kev-network-exposure
  2. Identify devices reporting this CVE and note which expose the affected service to untrusted networks.Telemetry: DeviceTvmSoftwareVulnerabilities · A network-reachable, no-privilege vector makes internet-facing instances the first exposure question. · Rule network-unauthenticated

Exploitation evidence

  1. Review relevant edge or application access logs for unusual requests around the advisory window.Telemetry: CommonSecurityLog · Log review is a hunting hypothesis; KEV listing alone does not show local exploitation. · Rule kev-network-exposure
Show more (2)

Exploitation evidence

  1. Review inbound connections to the affected service from unexpected sources since the advisory date.Telemetry: DeviceNetworkEvents · Hunting hypothesis from the CVSS vector; it does not show that exploitation occurred. · Rule network-unauthenticated

Response

  1. Recheck the affected assets after the source-stated mitigation or update is applied.Telemetry: DeviceTvmSoftwareVulnerabilities · A follow-up inventory check verifies local remediation. · Rule kev-network-exposure

CISA KEV Record

Catalog entry
08 Oct 2026
Required action due
11 Oct 2026
Known ransomware use
Unknown

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.

Change History & Source Data

— No recorded material change

CNA / source
cve@mitre.org
Record status · verification
NEW · CISA KEV confirmed
CPE
cpe:2.3:o:fedoraproject:fedora:20:*:*:*:*:*:*:*, cpe:2.3:o:fedoraproject:fedora:21:*:*:*:*:*:*:*, cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:*, cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*, cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*, cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*, cpe:2.3:o:opensuse:tumbleweed:-:*:*:*:*:*:*:*, cpe:2.3:o:suse:linux_enterprise_server:15:sp7:*:*:-:-:*:*, cpe:2.3:o:suse:linux_enterprise_server:15:sp7:*:*:-:sap:*:*, cpe:2.3:a:proftpd:proftpd:1.3.5:*:*:*:*:*:*:*

Evidence & Provenance

4 public sources
CISA KEV CatalogAdded 2026-10-08nvd.nist.govSource recordexploit-db.comSource recordexploit-db.comSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2015-3306
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2015-3306
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2015-3306"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

Correlated briefings

— No published briefing references this CVE

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.