CVE-2023-53959 FileZilla Client 3.63.1 DLL Hijacking via Missing TextShaping.dll

High 8.5 Published 19 Dec 2025 Updated 7 Apr 2026

Attackers can execute arbitrary code by placing a malicious DLL in the application directory, leading to remote code execution upon launch.

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

What is CVE-2023-53959?

CVE-2023-53959 is a high-severity code injection vulnerability in filezilla-project FileZilla Client, published on 19 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

FileZilla Client 3.63.1 contains a DLL hijacking vulnerability that allows attackers to execute malicious code by placing a crafted TextShaping.dll in the application directory. Attackers can generate a reverse shell payload using msfvenom and replace the missing DLL to achieve remote code execution when the application launches.

Weakness: CWE-427

Which versions are affected by CVE-2023-53959?

It affects 1 product.

Products include Filezilla-Project Filezilla Client.

How do I fix CVE-2023-53959?

No fix has been published for CVE-2023-53959 yet. Limit exposure of the affected software until one is available.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2023-53959 being exploited?

There is no known exploitation of CVE-2023-53959 in the wild and no public exploit code.

Sources

Also known as GHSA-4h23-hj4v-f4xg, UBUNTU-CVE-2023-53959.