Critical severity · published Dec 19, 2025
CVE-2023-53959
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
9.8
CVSS
0.9%
EPSS
No
On KEV
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
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 58% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FC
Filezilla Client · Filezilla-project
3.63.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-53959
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-53959
Product
https://filezilla-project.org/
Exploit
https://www.exploit-db.com/exploits/51267
Third Party Advisory
https://www.vulncheck.com/advisories/filezilla-client-dll-hijacking-via-missing-textshapingdll
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