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Ftp ServerApplication · Pcman

CVE-2025-5637

CRITICAL · 9.8 CVSS v3.1 Published 2025-06-05
Fix available
A fix is available. Upgrade to after 2.0.7 or later.
See remediation →
100/100
Remediation priority · Urgent
Public exploit Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
A vulnerability, which was classified as critical, was found in PCMan FTP Server 2.0.7. Affected is an unknown function of the component SYSTEM Command Handler. The manipulation leads to buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

Buffer overflow vulnerability in the SYSTEM command handler of PCMan FTP Server 2.0.7 allows remote attackers to execute arbitrary code due to improper bounds checking when processing the SYSTEM command input.

MitigationReplace or retire PCMan FTP Server 2.0.7 with a actively maintained FTP server; if continued use is required, restrict network access to the FTP service and implement additional network segmentation as a compensating control.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Ftp ServerApplication
Affected:<= 2.0.7

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Confirm PCMan FTP Server is installed
    Check running processes for pcmanftpd.exe or pcman.exe, or look for PCMan FTP Server in installed programs
    Affected if PCMan FTP Server process is running or installed on the system
  2. Identify installed version
    Right-click the executable, select Properties, and check the File Version field; or use 'wmic product where "name like '%PCMan%'" get version'
    Affected if Version is 2.0.7 or any version lower than 2.0.7
  3. Verify FTP service is network accessible
    Check listening ports with 'netstat -an | findstr "21"' or review firewall rules for port 21/FTP
    Affected if FTP service is bound to a network interface and accessible from remote systems
  4. Confirm SYSTEM command is available
    The SYSTEM command handler is built into the server binary; if the server is running and accepting commands, it processes SYSTEM requests
    Affected if The FTP server accepts commands from clients - the vulnerability is in the command handler itself with no disable option

The system is affected if PCMan FTP Server version 2.0.7 or lower is installed and the FTP service is running and accessible on the network.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to a release after 2.0.7
Interim mitigation

Replace or retire PCMan FTP Server 2.0.7 with a actively maintained FTP server; if continued use is required, restrict network access to the FTP service and implement additional network segmentation as a compensating control.

Recommended fix High confidence
  1. 1. Discontinue use of PCMan FTP Server 2.0.7 immediately as it is no longer maintained and has no available security patches.
  2. 2. Identify an actively maintained FTP server alternative suitable for your operational needs.
  3. 3. Migrate FTP services to a supported alternative such as FileZilla Server, ProFTPD, or vsftpd.
  4. 4. If FTP service is essential, implement network-level access controls (firewall rules, IP allowlisting) to limit exposure to untrusted networks until migration is complete.
  5. 5. Ensure new FTP server is configured with secure settings including TLS encryption, strong authentication, and appropriate access controls.
Caveat PCMan FTP Server is abandoned software with no supported version available; migration to a different FTP server product is required

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Ftp Server Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA2.0 h
20.0 hours of engineering $3,500
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-5637 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data