FileZilla Client 3.63.1 DLL Hijacking via Missing TextShaping.dll
Priority MEDIUM 46CWE-427Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-427.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00853 58th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Filezilla-Project | FileZilla Client | 3.63.1 | — | No fix listed | CNA |
- FileZilla Client VendorFilezilla-Project Affected 3.63.1 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:filezilla-project:filezilla_client:3.63.1:*:*:*:*:*:*:* | 3.63.1 | Vulnerable | Filezilla-Project |
- cpe:2.3:a:filezilla-project:filezilla_client:3.63.1:*:*:*:*:*:*:* Versions 3.63.1 Vulnerable ·Filezilla-Project
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2023-53959
- 2026-10-03 Alias added: GHSA-4h23-hj4v-f4xg
References
Exploit 1
Other 1
More Filezilla-Project Filezilla Client vulnerabilities
- TI-2023-26623 The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6… CVSS 3.1MEDIUM 5.9
- TI-2016-09123 FileZilla Client Installer uninstall.exe unquoted search path CVSS 3.1HIGH 7.8
- TI-2019-15736 FileZilla 3.40.0 Denial of Service via Local Search CVSS 4.0MEDIUM 6.9
- TI-2019-03838 Untrusted search path in FileZilla CVSS 3.1HIGH 7.8
- TI-2024-20860 In PuTTY 0.68 through 0.80 before 0.81, biased ECDSA nonce generation allows an attacker… CVSS 3.1MEDIUM 5.9
- TI-2022-12055 FileZilla v3.59.0 allows attackers to obtain cleartext passwords of connected SSH or FTP… CVSS 3.1MEDIUM 6.5
Sources
- CVE-2023-53959 · CVE Program
- CVE-2023-53959 · NVD
- FIRST EPSS
- GHSA-4h23-hj4v-f4xg · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences