High severity7.5NVD Advisory· Published Apr 5, 2026· Updated Jul 24, 2026
CVE-2019-25686
CVE-2019-25686
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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Affected products
2- Range: = 2.0 build 653
Patches
Vulnerability mechanics
References
4- www.exploit-db.com/exploits/46532nvdExploitVDB Entry
- www.vulncheck.com/advisories/core-ftp-build-653-pbsz-unauthenticated-denial-of-servicenvdThird Party Advisory
- coreftp.com/server/download/archive/CoreFTPServer653.exenvdProduct
- www.coreftp.comnvdProduct
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