CVE-2019-25686

HIGH EPSS 37.0%
Published Apr 5, 20262mo ago · Modified Jun 17, 20261w ago
8.7 CVSS 4.0
High
Find Similar
Published Apr 5, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
8.7
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
37.0% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available

Weaknesses 1

CWE-306 Missing Authentication for Critical Function Authentication

Affected Products 1

VendorProductVersionRange
coreftpcore_ftp2.0any

References 4

  • coreftp.com http://coreftp.com/server/download/archive/CoreFTPServer653.exe
    Product
  • coreftp.com http://www.coreftp.com/
    Product
  • exploit-db.com https://www.exploit-db.com/exploits/46532
    ExploitVDB Entry
  • vulncheck.com https://www.vulncheck.com/advisories/core-ftp-build-653-pbsz-unauthenticated-denial-of-service
    Third Party Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.