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CVE-2023-53959

FileZilla Client 3.63.1 DLL Hijacking via Missing TextShaping.dll

Published: Dec 19, 2025Updated: Dec 23, 2025 Sources: CVE List NVDCWE-427
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
0.7%
Top 50.5%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-427

Affected Products

FileZilla Clientfilezilla-project
Mixed
Consumer Software / file-utility
filezilla-projectoss-projectConsumer Softwareaka filezilla client, filezilla server, filezilla

Attack Graph

Products CVE Techniques Tactics

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Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

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MITRE ATT&CK

1 technique
Persistence
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References

https://www.exploit-db.com/exploits/51267
exploit-db.com
https://filezilla-project.org/
filezilla-project.org
https://www.vulncheck.com/advisories/filezilla-client-dll-hijacking-via-missing-textshapingdll
vulncheck.com

Timeline

Published
Dec 19, 2025
Last Updated
Dec 23, 2025

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