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Freefloat Ftp ServerApplication · Freefloat

CVE-2025-5550

CRITICAL · 9.8 CVSS v3.1 Published 2025-06-04
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
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 was found in FreeFloat FTP Server 1.0 and classified as critical. Affected by this issue is some unknown functionality of the component PBSZ Command Handler. The manipulation leads to buffer overflow. The attack may be launched 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

A buffer overflow vulnerability exists in the PBSZ (Protection Buffer Size) command handler of FreeFloat FTP Server 1.0, allowing remote attackers to potentially execute arbitrary code via specially crafted input to the vulnerable command processing function.

MitigationReplace FreeFloat FTP Server with a currently maintained FTP server solution or retire the service entirely, as FreeFloat is a discontinued product with no official security patches available.

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
Freefloat Ftp ServerApplication
Affected:= 1.0

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. Identify if FreeFloat FTP Server is installed
    Check system for FreeFloat FTP Server installation by searching for executable files named 'FreeFloat' or 'ftpserver' in Program Files, Program Files (x86), or other common installation directories. Also check Windows Services for a service named 'FreeFloat' or similar.
    Affected if FreeFloat FTP Server executable is found on the system
  2. Check the running version
    If found, right-click the executable, select Properties, then go to the Details tab to view the File Version. Alternatively, run 'wmic product get name,version' or check the Windows Services description for version information.
    Affected if Version is 1.0 exactly (this is the only affected version)
  3. Verify if the FTP service is running
    Open Services (services.msc), locate the FreeFloat FTP Server service, and check its Status column. Or run 'netstat -an | findstr :21' to check if port 21 (default FTP port) is listening.
    Affected if The FreeFloat FTP service is currently running and accepting connections
  4. Confirm network exposure
    Check if the FTP server is bound to a network-facing IP address by reviewing the service configuration or running 'netstat -anob' to see which addresses the FTP listener is bound to.
    Affected if The service is listening on a reachable IP address (especially external/routable IPs)
  5. Test PBSZ command processing (optional verification)
    Connect to the FTP server using any FTP client and issue the PBSZ command with a large payload (e.g., 'PBSZ 999999999') to observe server response behavior. A vulnerable server may crash or behave unexpectedly.
    Affected if The server exhibits unstable behavior or crashes when processing the PBSZ command with oversized input

You are affected if FreeFloat FTP Server version 1.0 is installed, running, and exposed on your 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
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Replace FreeFloat FTP Server with a currently maintained FTP server solution or retire the service entirely, as FreeFloat is a discontinued product with no official security patches available.

Recommended fix High confidence
  1. 1. Discontinue use of FreeFloat FTP Server 1.0 immediately as it is abandoned software with no vendor support or patches available.
  2. 2. Migrate to a actively maintained FTP server solution such as vsftpd, ProFTPD, FileZilla Server, or another modern alternative.
  3. 3. If FTP functionality is required, ensure the replacement server is configured with secure settings including TLS/SSL encryption (FTPS), strong authentication, and appropriate access controls.
  4. 4. If legacy systems depend on FreeFloat FTP Server, consider isolating the server in a restricted network segment or implementing additional network-level controls to mitigate risk.
  5. 5. Implement additional monitoring and intrusion detection to detect any exploitation attempts targeting this known vulnerability.
Caveat FreeFloat FTP Server 1.0 has no available updates or patches; the product is abandoned and should be replaced entirely.

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

Fix this in Freefloat Ftp Server Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing3.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,490
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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-2025-5550 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
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  • Version or environment caveats, and links to real fixes
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