CVE-2019-25686

Core FTP 2.0 build 653 PBSZ Unauthenticated Denial of Service

Published Apr 5, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Core FTP 2.0 build 653 PBSZ Unauthenticated Denial of Service
First Time appeared Coreftp
Coreftp core Ftp
Weaknesses CWE-306
CPEs cpe:2.3:a:coreftp:core_ftp:2.0:build_653:*:*:*:*:*:*
Vendors & Products Coreftp
Coreftp core Ftp
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Apr 6, 2026, 3:43 PM
Reserved
Apr 5, 2026, 3:24 PM
Status
Analyzed
Published
Apr 5, 2026, 9:16 PM
Modified
Jul 24, 2026, 10:10 PM