FileZilla Client 3.63.1 DLL Hijacking via Missing TextShaping.dll

Advisories

severity: high
date: December 19, 2025
Affecting: FileZilla Client 3.63.1
CVE: CVE-2023-53959
CWE: CWE-427 Uncontrolled Search Path Element
CVSS: 8.5
CVSS V4 Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References: ExploitDB-51267
Official Product Homepage
Credit: Bilal Qureshi
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.