DLL Hijacking Vulnerability in FileZilla Client by FileZilla
CVE-2023-53959

8.5HIGH

Key Information:

Vendor

Filezilla-project

Status
Filezilla Client
Vendor
CVE Published:
19 December 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2023-53959?

The FileZilla Client version 3.63.1 is susceptible to a DLL hijacking vulnerability that permits attackers to execute arbitrary code. By strategically placing a manipulated TextShaping.dll file within the application directory, malicious actors can initiate a reverse shell payload. This vulnerability allows remote code execution as soon as the application is launched, thereby compromising the integrity of the system.

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Affected Version(s)

FileZilla Client 3.63.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2023-53959 - Proof of Concept

References

https://www.exploit-db.com/exploits/51267
exploit
https://filezilla-project.org/
product
https://www.vulncheck.com/advisories/filezilla-client-dll...
third-party-advisory

CVSS V4

Score:
8.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Bilal Qureshi
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