CVE-2019-25683 FileZilla 3.40.0 Denial of Service via Local Search

Medium 6.9 Published 5 Apr 2026 Updated 6 Apr 2026

Local attackers can crash the FileZilla FTP client by entering a malformed path string in the local search field, causing a denial of service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2019-25683?

CVE-2019-25683 is a medium-severity denial of service vulnerability in Filezilla-Project FileZilla, published on 5 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

FileZilla 3.40.0 contains a denial of service vulnerability in the local search functionality that allows local attackers to crash the application by supplying a malformed path string. Attackers can trigger the crash by entering a crafted path containing 384 'A' characters followed by 'BBBB' and 'CCCC' sequences in the search directory field and initiating a local search operation.

Weakness: CWE-532

Which versions are affected by CVE-2019-25683?

It affects 1 product.

Products include Filezilla-Project Filezilla Client.

How do I fix CVE-2019-25683?

No fix has been published for CVE-2019-25683 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2019-25683 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-25683 exists.

Sources

Also known as GHSA-g5wj-4965-6q9m, UBUNTU-CVE-2019-25683.