CVE-2023-53959

CRITICAL 9.8

FileZilla Client 3.63.1 DLL Hijacking via Missing TextShaping.dll

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-427
Vendor	filezilla-project
Product	filezilla client
Published	Dec 19, 2025
Last Updated	Apr 7, 2026

Stay Ahead of the Next One

Get instant alerts for filezilla-project filezilla client

Be the first to know when new critical vulnerabilities affecting filezilla-project filezilla client are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

filezilla-project / FileZilla Client

3.63.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Bilal Qureshi