PT-2025-52529 · Filezilla · Filezilla Client

Bilal Qureshi · Published 2025-12-19 · Updated 2025-12-20 · CVE-2023-53959

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions FileZilla Client version 3.63.1

Description The FileZilla Client application is susceptible to a DLL hijacking issue. An attacker can exploit this by placing a specially crafted TextShaping.dll file within the application directory. Successful exploitation allows the attacker to execute malicious code, potentially achieving remote code execution when the application is launched. The attack involves replacing a missing DLL with a malicious payload, which can be generated using tools like msfvenom.

Recommendations Replace the TextShaping.dll file in the FileZilla Client application directory with a legitimate version.

Exploit

Fix

RCE

Uncontrolled Search Path Element

Weakness Enumeration

CWE-427

Related Identifiers

CVE-2023-53959

Affected Products

Filezilla Client

References · 12

• 🔥 https://exploit-db.com/exploits/51267 · Exploit
• https://cve.org/CVERecord?id=CVE-2023-53959 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2023-53959 · Security Note
• https://ubuntu.com/security/CVE-2023-53959 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-53959 · Vendor Advisory
• https://twitter.com/CVEnew/status/2002466762516791621 · Twitter Post
• https://filezilla-project.org · Note
• https://vulncheck.com/advisories/filezilla-client-dll-hijacking-via-missing-textshapingdll · Note
• https://t.me/CVEtracker/40321 · Telegram Post
• https://twitter.com/TheHackerWire/status/2002127281204969607 · Twitter Post
• https://twitter.com/CveFindCom/status/2002131600763408652 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2002133213179744261 · Twitter Post