Heap-based buffer overflow in Fortinet FortiClient for Windows - CVE-2025-46373
Published: November 18, 2025
Vulnerability identifier: #VU118598
CSH Severity: Low
CVSS v4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-46373
CWE-ID: CWE-122
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local authenticated user to execute arbitrary code.
The vulnerability exists due to heap-based buffer overflow via fortips driver. An authenticated local ipsec user can execute arbitrary code or commands via "fortips_74.sys" driver. The attacker would need to bypass the Windows heap integrity protections.
Affected software
Fortinet FortiClient for Windows
How to mitigate CVE-2025-46373
Install update from vendor's website.
Fortinet FortiClient for Windows - addressed in versions 7.2.9, 7.4.4