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Full vulnerability report · 2015
CVE-2015-3306High confidence

ProFTPD Improper Access Control Vulnerability

ProFTPD · ProFTPD

10.0CriticalCVSS 3.1
Recommended action
Patch now

CISA confirms exploitation in the wild and lists 2026-10-11 as the remediation due date.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityCriticalOperational priority:Critical, unchanged from published severity.unchanged

Evidence used

  • CISA confirms exploitation in the wild.
  • A structured source references public exploit or proof-of-concept material.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 99.50% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs ProFTPD ProFTPD and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 3 daysRemediation target: Within 90 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Distribution package intelligence

Release-specific package status

Debian findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

4 package states
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Debian trixietrixie · sourceproftpd-dfsgVendor fix publishedDebian records a fixed source-package version for this release.1.3.5-2Debian Security Tracker ↗Source updated 4 Nov 2026
Debian bookwormbookworm · sourceproftpd-dfsgVendor fix publishedDebian records a fixed source-package version for this release.1.3.5-2Debian Security Tracker ↗Source updated 4 Nov 2026
Debian forkyforky · sourceproftpd-dfsgVendor fix publishedDebian records a fixed source-package version for this release.1.3.5-2Debian Security Tracker ↗Source updated 4 Nov 2026
Debian sidsid · sourceproftpd-dfsgVendor fix publishedDebian records a fixed source-package version for this release.1.3.5-2Debian Security Tracker ↗Source updated 4 Nov 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

2 current
CVE-2015-3306 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityproftpd: unauthenticated copying of files via SITE CPFR/CPTO allowed by mod_copy
1 known not affected

The vendor explicitly states that these products are not affected by this CVE.

  • All currently supported Red Hat products
Summary
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.
Remediation
No remediation text is recorded.
CVE-2015-3306 · CSAF 2.0 · revision 11 · interimSUSE Product Security TeamCVE-2015-3306
36 recommended

The vendor recommends these product versions as the target state.

  • proftpd-1.3.8b-150600.13.6.1 as component of SUSE Linux Enterprise Module for Server Applications 15 SP7
  • proftpd-devel-1.3.8b-150600.13.6.1 as component of SUSE Linux Enterprise Module for Server Applications 15 SP7
  • proftpd-doc-1.3.8b-150600.13.6.1 as component of SUSE Linux Enterprise Module for Server Applications 15 SP7
  • proftpd-lang-1.3.8b-150600.13.6.1 as component of SUSE Linux Enterprise Module for Server Applications 15 SP7
  • proftpd-ldap-1.3.8b-150600.13.6.1 as component of SUSE Linux Enterprise Module for Server Applications 15 SP7
  • proftpd-mysql-1.3.8b-150600.13.6.1 as component of SUSE Linux Enterprise Module for Server Applications 15 SP7
  • proftpd-pgsql-1.3.8b-150600.13.6.1 as component of SUSE Linux Enterprise Module for Server Applications 15 SP7
  • proftpd-radius-1.3.8b-150600.13.6.1 as component of SUSE Linux Enterprise Module for Server Applications 15 SP7
  • proftpd-sqlite-1.3.8b-150600.13.6.1 as component of SUSE Linux Enterprise Module for Server Applications 15 SP7
  • proftpd-1.3.8b-150600.13.6.1 as component of SUSE Linux Enterprise Server 15 SP7
  • proftpd-devel-1.3.8b-150600.13.6.1 as component of SUSE Linux Enterprise Server 15 SP7
  • proftpd-doc-1.3.8b-150600.13.6.1 as component of SUSE Linux Enterprise Server 15 SP7
Summary
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.
Remediation
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2015-3352

CISA KEV mirrored by ENISA

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.

EUVD state
Present in the current official mapping
Known exploitation
Recorded by ENISA since 8 Oct 2026. Evidence sources: cisa_kev.
ENISA score
10.0 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch now

CISA confirms exploitation in the wild and lists 2026-10-11 as the remediation due date.

Patch available
01

What, why and how

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.

What

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.

Why

The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

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.

Why

The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Confirmed in the wild

CISA added this CVE to its Known Exploited Vulnerabilities catalogue on 2026-10-08.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
a network path → Improper Access Control → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Changed: exploitation can affect a different security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-284 ↗

CWE-284: Improper Access Control. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SChangedScope: The attack can affect a component governed by a different security authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-284CISA KEVPublic exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2015-3352Known-exploited evidence recorded

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.

Official EUVD record ↗
CERT-FR · French · CERTFR-2015-AVI-235Vulnérabilité dans ProFTPd

Une vulnérabilité a été corrigée dans ProFTPd . Elle permet à un attaquant de provoquer une exécution de code arbitraire à distance.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2015-002727ProFTPD の mod_copy モジュールにおける任意のファイルを読み書きされる脆弱性

ProFTPD の mod_copy モジュールには、任意のファイルを読み書きされる脆弱性が存在します。 補足情報 : CWE による脆弱性タイプは、CWE-284: Improper Access Control (不適切なアクセス制御) と識別されています。 http://cwe.mitre.org/data/definitions/284.html

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-6984美 CISA 발표 주요 Exploit 정보공유(Update. 2026-10-08)

ProFTPD Improper Access Control Vulnerability

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
n/a
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 18 May 2015 · Last source change 9 Oct 2026, 16:02 UTC · CWE-284 · Improper Access Control

CVE recordCVE.org · 5.2
CVSS sourceCISA ADP
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-09-01
European sourceENISA EUVD · EUVD-2015-3352
Product sourceCISA KEV
Remediation sourceVendor CSAF · SUSE Product Security Team
CWE sourceCISA ADP
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Vendor guidanceAuthoritative vendor guidance changed: removed remediation: suse.com/CVE-2015-3306.
    Before
    remediation: suse.com/CVE-2015-3306
    After
    no authoritative guidance recorded
    CISA KEV ↗
  2. Remediation statusRemediation status changed from Mitigation available to Awaiting fix.
    Before
    Mitigation available
    After
    Awaiting fix
    CISA KEV ↗
  3. BlackTree coverageBlackTree article coverage changed from no BlackTree article to 1 BlackTree article.
    Before
    no BlackTree article
    After
    1 BlackTree article
    BlackTree editorial ↗
  4. Vendor guidanceAuthoritative vendor guidance changed: removed remediation: suse.com/CVE-2015-3306.
    Before
    remediation: suse.com/CVE-2015-3306
    After
    no authoritative guidance recorded
    CISA KEV ↗
  5. Remediation statusRemediation status changed from Mitigation available to Awaiting fix.
    Before
    Mitigation available
    After
    Awaiting fix
    CISA KEV ↗
  6. Remediation statusRemediation status changed from Awaiting fix to Mitigation available.
    Before
    Awaiting fix
    After
    Mitigation available
    SUSE Product Security Team ↗
  7. ENISA known-exploited stateENISA EUVD now records this CVE in its known-exploited dataset.
    Before
    not listed in ENISA EUVD known-exploited dataset
    After
    listed in ENISA EUVD known-exploited dataset (EUVD-2015-3352)
    ENISA EUVD ↗
  8. SeveritySeverity changed from High to Critical.
    Before
    High
    After
    Critical
    CISA ADP ↗
  9. CVSS scoreCVSS version changed from 2.0 to 3.1; the displayed base score remains 10.0.
    Before
    10.0 (CVSS 2.0 · NIST NVD · AV:N/AC:L/Au:N/C:C/I:C/A:C)
    After
    10.0 (CVSS 3.1 · CISA ADP · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)
    CISA ADP ↗
  10. ENISA EUVD mappingEUVD-2015-3352 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2015-3352"}
    ENISA EUVD ↗
  11. CISA KEV stateCISA KEV now confirms exploitation in the wild.
    Before
    not listed in CISA KEV
    After
    listed in CISA KEV since 2026-10-08
    CISA KEV ↗
  12. Vendor guidanceAuthoritative vendor guidance changed: removed vendor advisory: debian.org/dsa-3263; removed vendor advisory: lists.fedoraproject.org/157053.html; 3 further removals.
    Before
    vendor advisory: debian.org/dsa-3263 · vendor advisory: lists.fedoraproject.org/157053.html · vendor advisory: lists.fedoraproject.org/157054.html · 2 more references
    After
    no authoritative guidance recorded
    CNA ↗
  13. SeveritySeverity changed from Unknown to High.
    Before
    Unknown
    After
    High
    NIST NVD ↗
  14. CVSS scoreCVSS score changed from not recorded to 10.0 (CVSS 2.0 · NIST NVD · AV:N/AC:L/Au:N/C:C/I:C/A:C).
    Before
    not recorded
    After
    10.0 (CVSS 2.0 · NIST NVD · AV:N/AC:L/Au:N/C:C/I:C/A:C)
    NIST NVD ↗
  15. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Added to CISA KEV
ENISA EUVD · EUVD-2015-3352↗Vendor CSAF · SUSE Product Security Team↗CISA KEV record↗CVE authority or vendor reference↗Public exploit reference↗Public exploit reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2015-3306 · cve.blacktree.nl