Denial of Service Vulnerability in Core FTP 2.0 Build 653 by Core FTP
CVE-2019-25686

8.7HIGH

Key Information:

Vendor

Coreftp

Status
Core Ftp
Vendor
CVE Published:
5 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2019-25686?

Core FTP 2.0 build 653 is susceptible to a denial of service vulnerability that arises from the PBSZ command. An unauthenticated attacker can exploit this flaw by sending a specially crafted PBSZ command with a buffer size exceeding 211 bytes. This results in an access violation, effectively crashing the FTP server process and making it temporarily unavailable to legitimate users. It is essential for users of this software version to apply the recommended updates to mitigate this risk.

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Affected Version(s)

Core FTP 2.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2019-25686 - Proof of Concept

References

https://www.exploit-db.com/exploits/46532
exploit
http://www.coreftp.com/
product
http://coreftp.com/server/download/archive/CoreFTPServer6...
product

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Hodorsec (hodorsec@protonmail.com / hodor@hodorsec.com)
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