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CVE-2019-25686

7.5 · HIGH

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 buf…

Published Apr 5, 2026CWE-306EPSS 0.47%

Overview

CVE-2019-25686 is a high-severity vulnerability. It was published on April 5, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refcoreftp.com/server/download/archive/CoreFTPServer653.exeRefwww.coreftp.com/Refwww.exploit-db.com/exploits/46532Refwww.vulncheck.com/advisories/core-ftp-build-653-pbsz-unauthenticated-denial-of-service

How CyberStrike helps

Frequently asked questions

What is CVE-2019-25686?

CVE-2019-25686 is a high-severity vulnerability. It was published on April 5, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2019-25686?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-25686?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-25686?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-25686 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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