CVE-2019-25686

Name: CVE-2019-25686
Creator: NVD / NIST
Published: 2026-04-05T21:16:47.31+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.7/10EPSS 0.47%

Last modified Jun 17, 2026

CVE-2019-25686 is a high-severity vulnerability rated 8.7/10 on the CVSS scale. Core FTP 2.0 build 653 contains a denial of service vulnerability in the PBSZ command that allows unauthenticated attackers to crash the service by sending a malformed command with an oversized buffer. Attackers can send a PBSZ command with a payload exceeding 211 bytes to trigger an access violation and crash the FTP server process.. EPSS estimates a 0.47% chance of exploitation in the next 30 days.

Description

Core FTP 2.0 build 653 contains a denial of service vulnerability in the PBSZ command that allows unauthenticated attackers to crash the service by sending a malformed command with an oversized buffer. Attackers can send a PBSZ command with a payload exceeding 211 bytes to trigger an access violation and crash the FTP server process.

Metrics

CVSS 3.1

7.5/10

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

CVSS 4.0

8.7/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.47%

36.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-306

Affected Software

Vendor	Product	Versions	Update
Coreftp	Core Ftp	2.0	Build 653

References

http://coreftp.com/server/download/archive/CoreFTPServer653.exeProduct
http://www.coreftp.com/Product
https://www.exploit-db.com/exploits/46532Exploit, VDB Entry
https://www.vulncheck.com/advisories/core-ftp-build-653-pbsz-unauthenticated-denial-of-serviceThird Party Advisory

Timeline

Published: Apr 5, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2019-25686?

How severe is CVE-2019-25686?

CVE-2019-25686 has a CVSS score of 8.7/10 (HIGH severity). The EPSS model estimates a 0.47% probability of exploitation in the next 30 days.

How do I fix CVE-2019-25686?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-25686?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST