Is CVE-2009-4105 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2009-4105, but active exploitation has not been confirmed.

Can CVE-2009-4105 be exploited remotely?

Yes. CVE-2009-4105 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2009-4105?

CVE-2009-4105 has a CVSS score of 3.5 (LOW).

HOME VULNERABILITIESCVE-2009-4105

LOWPOC

CVE-2009-4105

CWE-20Published: November 29, 2009· Updated: Jun 16, 2026

3.5

CVSS v3.1

Official Description

TYPSoft FTP Server 1.10 allows remote authenticated users to cause a denial of service (crash) by sending an APPE (append) command immediately followed by a DELE (delete) command without sending file data in between these two commands.

NVD Source

Technical Analysis

CVE-2009-4105 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A proof-of-concept (PoC) exploit exists for CVE-2009-4105. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.