High 7.5Published Apr 5, 2026

CVE-2019-25686Core FTP 2.0 build 653 PBSZ Unauthenticated Denial of Service

Updated under an hour ago (Oct 26, 2026, 12:10 AM ET)

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It affects Coreftp Core FTP. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-306
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Analyzed
Record last updated: Apr 6, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Coreftp Core FTP coreftp:core_ftp (from the name)	2.0	CNA record
coreftp core_ftp coreftp:core_ftp	2.0	NVD

References

https://www.exploit-db.com/exploits/46532exploit, vdb-entry
http://www.coreftp.com/product
http://coreftp.com/server/download/archive/CoreFTPServer653.exeproduct
https://www.vulncheck.com/advisories/core-ftp-build-653-pbsz-unauthenticated-denial-of-servicethird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.