CVE-2019-25686

moderate-risk
Published 2026-04-05

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.

Do I need to act?

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0.16% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10 High
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Coreftp

References (4)

Product http://coreftp.com/server/download/archive/CoreFTPServer653.exe
Product http://www.coreftp.com/
Exploit https://www.exploit-db.com/exploits/46532
Third Party Advisory https://www.vulncheck.com/advisories/core-ftp-build-653-pbsz-unauthenticated-den...
32
/ 100
moderate-risk
Severity 26/34 · High
Exploitability 1/34 · Minimal
Exposure 5/34 · Minimal