Critical 9.8Published Dec 19, 2025

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

Updated under an hour ago (Oct 28, 2026, 2:40 AM ET)

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It affects filezilla-project FileZilla Client and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for filezilla-project FileZilla Client

Exploited in the last 30 days

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: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-427
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Analyzed
Record last updated: Apr 7, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

filezilla-project FileZilla Client filezilla_project:filezilla_client (from the name)	3.63.1	CNA record
filezilla-project filezilla_client filezilla-project:filezilla_client	3.63.1	NVD

References

References

https://www.exploit-db.com/exploits/51267	exploit, third-party-advisory, vdb-entry
https://filezilla-project.org/	product
https://www.vulncheck.com/advisories/filezilla-client-dll-hijacking-via-missing-textshapingdll	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.