CVE-2019-25654Public exploit

Service crash via oversized User domain value

Published Mar 30, 2026 · Updated Mar 30, 2026

Buffer overflow in Core FTP/SFTP Server v2 Build 673 allows local users to crash the service through the User domain configuration. The domain setup handler accepts a 7,000-byte User domain value without rejecting its excessive length, causing an out-of-bounds write when the configuration is saved. Exploitation requires interactive access to the Windows setup interface with WinNT users enabled; the demonstrated consequence is a service crash.

CVSS severity8.7
High
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Buffer overflow in Core FTP/SFTP Server v2 Build 673 allows local users to crash the service through the User domain configuration. The domain setup handler accepts a 7,000-byte User domain value without rejecting its excessive length, causing an out-of-bounds write when the configuration is saved. Exploitation requires interactive access to the Windows setup interface with WinNT users enabled; the demonstrated consequence is a service crash.

The record

CVE
CVE-2019-25654
Published
Mar 30, 2026
Updated
Mar 30, 2026
Vendor
Core FTP
Product
Core FTP Server
Classifications
CWE-787, T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=v2-Build 673

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Core FTP · Core FTP Serverversion=v2-Build 673

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo