CVE-2023-53959 | FileZilla Client 3.63.1 contains a DLL hijacking vulnerabili… | CVSS 9.8 CRITICAL

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.

Metadata

CVE ID: CVE-2023-53959
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2025-12-19 14:03 UTC
Published: 2025-12-19 21:05 UTC
Last updated: 2026-04-07 14:08 UTC
Primary CWE: CWE-427
Uncontrolled Search Path Element
Vendor / Product: filezilla-project / FileZilla Client
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
filezilla-project	FileZilla Client	—	3.63.1

Weakness (CWE)

CWE	Source	Description
CWE-427	cna	Uncontrolled Search Path Element

CVSS scores (2)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.5	HIGH	4.0	cna	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 (3)

ExploitDB-51267 https://www.exploit-db.com/exploits/51267
Official Product Homepage https://filezilla-project.org/
VulnCheck Advisory: FileZilla Client 3.63.1 DLL Hijacking via Missing TextShaping.dll https://www.vulncheck.com/advisories/filezilla-client-dll-hijacking-via-missing-textshapingdll