CVE-2021-4432 - CVE House

Back to Database

Status published Medium CVE-2021-4432

PCMan FTP Server USER Command denial of service

5.3 CVSS

Vulnerability Description

A vulnerability was found in PCMan FTP Server 2.0.7. It has been classified as problematic. This affects an unknown part of the component USER Command Handler. The manipulation leads to denial of service. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The associated identifier of this vulnerability is VDB-250719.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2021-4432

Check My Exposure

Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

fernando.mengali (VulDB User)

References

More from PCMan

View All →

PCMan FTP Server SYSTEM Command buffer overflow

PCMan FTP Server SET Command buffer overflow

PCMan FTP Server PLS Command buffer overflow

PCMan FTP Server NOOP Command buffer overflow

PCMan FTP Server NLST Command buffer overflow

Affected Vendor

PCMan

View all reports →

Affected Software

FTP Server

Vulnerable Versions:

2.0.7

Timeline

Official Publish: January 16th, 2024

Last Modified: June 17th, 2025

Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1499 Endpoint Denial of Service

T1498 Network Denial of Service

T1562 Impair Defenses

Defense Evasion

T1190 Exploit Public-Facing Application

T1046 Network Service Discovery