CVE-2023-53959 - CVE House

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Status published High CVE-2023-53959

FileZilla Client 3.63.1 DLL Hijacking via Missing TextShaping.dll

8.5 CVSS

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

Bilal Qureshi

References

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Affected Vendor

filezilla-project

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Affected Software

FileZilla Client

Vulnerable Versions:

3.63.1

Timeline

Official Publish: December 19th, 2025

Last Modified: April 7th, 2026

Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1574 Hijack Execution Flow

T1574.001 DLL Search Order Hijacking

Privilege Escalation

T1547 Boot or Logon Autostart Execution

T1036 Masquerading

Defense Evasion

T1059 Command and Scripting Interpreter