Improper access control in Serv-U FTP Server and Serv-U MFT Server - CVE-2025-40541
Published: February 24, 2026 / Updated: July 27, 2026
Vulnerability identifier: #VU123152
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-40541
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to Insecure Direct Object Reference (IDOR) issue. A remote attacker can bypass implemented security restrictions and execute arbitrary code on the system.
Affected software
Serv-U FTP Server
Serv-U MFT Server
Serv-U MFT Server
How to mitigate CVE-2025-40541
Install updates from vendor's website.
Serv-U FTP Server - update to 15.5.4
Serv-U MFT Server - update to 15.5.4
Serv-U MFT Server - update to 15.5.4