What’s Vulnerable › Vulnerabilities

CVE-2023-53959: FileZilla Client 3.63.1 DLL Hijacking via Missing TextShaping.dll

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-12-19 · updated 2026-06-17
• Weakness: CWE-427

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.

Affected products

• Filezilla-Project FileZilla: 3.63.1

References

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

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