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Stack-based Buffer OverflowWeakness · CWE-121

CVE-2019-25361

CRITICAL · 9.8 CVSS v3.1 Published 2026-02-18
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
Ayukov NFTP client 1.71 contains a buffer overflow vulnerability in the SYST command handling that allows remote attackers to execute arbitrary code. Attackers can send a specially crafted SYST command with oversized payload to trigger a buffer overflow and execute a bind shell on port 5150.

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 · high confidence

Buffer overflow vulnerability in Ayukov NFTP client version 1.71 in the SYST command handler allows remote attackers to send a specially crafted oversized payload that overflows a buffer, enabling arbitrary code execution including a bind shell on port 5150.

MitigationUpdate Ayukov NFTP client to a patched version if available; otherwise disable or remove the vulnerable client. Network-level filtering of malformed FTP commands may provide temporary mitigation.

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

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. Verify Ayukov NFTP client installation
    Search for nftp.exe or the NFTP client executable in program directories, system PATH, or running processes using tasklist or Get-Process commands
    Affected if The Ayukov NFTP client executable is found on the system
  2. Confirm installed version
    Run the client executable with a version flag (such as -v or --version) or inspect the file properties of the executable
    Affected if The installed version is 1.71
  3. Determine if NFTP service is active
    Check for NFTP client process running and listening on network ports using netstat or by inspecting running services
    Affected if The NFTP client service is running and accessible to network connections
  4. Scan for suspicious listener on port 5150
    Use netstat -an or similar network inspection tool to check for any process listening on TCP port 5150
    Affected if An unexpected or unauthorized process is bound to port 5150

A system is affected if the Ayukov NFTP client version 1.71 is installed and running, particularly if network access to the service is exposed and an unknown listener is observed on port 5150.

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.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Update Ayukov NFTP client to a patched version if available; otherwise disable or remove the vulnerable client. Network-level filtering of malformed FTP commands may provide temporary mitigation.

Have this fixed Scoped from the published advisory
  • Consultation2.0 h
  • Implementation1.0 h
  • Testing1.0 h
  • Review / QA1.0 h
5.0 hours of engineering $910
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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-2019-25361 in production — separate from our analysis above.

No notes yet

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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
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