CVE-2019-25686CWE-306

Core FTP 2.0 build 653 PBSZ Unauthenticated Denial of Service

High · published April 5, 2026

CVSS v4.0
8.7
EPSS
0%
Percentile
39.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.7 · HIGH
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
EPSS
0.00466 · 39.4th percentile
Weakness
CWE-306 · Missing Authentication for Critical Function
Published
2026-04-05T20:45Z
EPSS history
Timeline
  • 05 APR 20:45Z
    Core FTP 2.0 build 653 PBSZ Unauthenticated Denial of Service
    cvelistv5