CVE-2019-25686
Received Received - Intake
Buffer Overflow in Core FTP PBSZ Command Causes DoS Crash

Publication date: 2026-04-05

Last updated on: 2026-04-09

Assigner: VulnCheck

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.
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Meta Information
Published
2026-04-05
Last Modified
2026-04-09
Generated
2026-06-16
AI Q&A
2026-04-06
EPSS Evaluated
2026-06-15
NVD
CVE-2019-25686
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
coreftp core_ftp 2.0
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
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Executive Summary

This vulnerability exists in Core FTP 2.0 build 653 and involves the PBSZ command. An unauthenticated attacker can send a malformed PBSZ command with an oversized buffer exceeding 211 bytes. This causes an access violation that crashes the FTP server process, resulting in a denial of service.

Impact Analysis

The impact of this vulnerability is a denial of service condition. An attacker can crash the FTP server by sending a specially crafted PBSZ command, causing the service to become unavailable. This can disrupt normal operations and prevent legitimate users from accessing the FTP service.

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