CVE-2015-10003 FileZilla Server PORT confused deputy

Medium 4.3 Published 17 Jul 2022 Updated 15 Apr 2025

Remote attackers can exploit the PORT handler to act as an unintended intermediary, bypassing security controls in FileZilla Server.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2015-10003?

CVE-2015-10003 is a medium-severity server-side request forgery vulnerability in FileZilla Server, published on 17 Jul 2022. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability, which was classified as problematic, was found in FileZilla Server up to 0.9.50. This affects an unknown part of the component PORT Handler. The manipulation leads to unintended intermediary. It is possible to initiate the attack remotely. Upgrading to version 0.9.51 is able to address this issue. It is recommended to upgrade the affected component.

Weakness: CWE-610, CWE-441

Which versions are affected by CVE-2015-10003?

It affects 1 product.

Products include Filezilla-Project Filezilla Server.

How do I fix CVE-2015-10003?

No fix has been published for CVE-2015-10003 yet. Limit exposure of the affected software until one is available.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2015-10003 being exploited?

There is no known exploitation of CVE-2015-10003 in the wild and no public exploit code.

Sources

Also known as GHSA-5jfq-8pvr-x22v.