CVE-2019-25686

HIGH

Core FTP 2.0 build 653 PBSZ Unauthenticated Denial of Service

Title source: cna
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2019-25686. PoCs published by Hodorsec.

AI-analyzed exploit summary This Python script demonstrates a Denial of Service (DoS) vulnerability in Core FTP Server 2.0 build 653 by sending a maliciously crafted PBSZ command. The exploit triggers an access violation by overwriting the ECX register with a controlled buffer, leading to a crash.

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.

Exploits (1)

exploitdb WORKING POC
by Hodorsec · pythondoswindows
https://www.exploit-db.com/exploits/46532

This Python script demonstrates a Denial of Service (DoS) vulnerability in Core FTP Server 2.0 build 653 by sending a maliciously crafted PBSZ command. The exploit triggers an access violation by overwriting the ECX register with a controlled buffer, leading to a crash.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Core FTP Server 2.0 build 653
No auth needed
Prerequisites: Network access to the target FTP server
devstral-2 · analyzed Apr 07, 2026 Full analysis →

References (4)

Core 4
Core References
Exploit exploit
ExploitDB-46532
https://www.exploit-db.com/exploits/46532
Product product
Official Product Homepage
http://www.coreftp.com/
Third Party Advisory third-party-advisory
VulnCheck Advisory: Core FTP 2.0 build 653 PBSZ Unauthenticated Denial of Service
https://www.vulncheck.com/advisories/core-ftp-build-653-pbsz-unauthenticated-denial-of-service

Scores

CVSS v3 7.5
EPSS 0.0047
EPSS Percentile 36.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-306
Status published
Products (2)
Coreftp/Core FTP 2.0
coreftp/core_ftp 2.0 build_653
Published Apr 05, 2026
Tracked Since Apr 06, 2026