Vulnerability · Published Dec 19, 2025 · Assigned by VulnCheck
CVE-2023-53959FileZilla Client 3.63.1 DLL Hijacking via Missing TextShaping.dll
Critical 9.8
In plain English
A critical-severity uncontrolled search path in FileZilla Client from filezilla-project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 58% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.9%top 41.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | filezilla | no fix listed | UBUNTU-CVE-2023-53959 |
| Ubuntu:24.04:LTS | filezilla | no fix listed | UBUNTU-CVE-2023-53959 |
| Ubuntu:25.10 | filezilla | no fix listed | UBUNTU-CVE-2023-53959 |
| Ubuntu:26.04:LTS | filezilla | no fix listed | UBUNTU-CVE-2023-53959 |
| Ubuntu:26.10 | filezilla | no fix listed | UBUNTU-CVE-2023-53959 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| filezilla-project | FileZilla Client | 3.63.1 |
Weakness: CWE-427 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- ExploitDB-51267 exploit
- Official Product Homepage product
- VulnCheck Advisory: FileZilla Client 3.63.1 DLL Hijacking via Missing TextShaping.dll third-party-advisory