CVE-2025-46373 Memory corruption in FortiClientWindows
An authenticated local IPSec user can execute arbitrary code via a heap buffer overflow in FortiClient Windows, bypassing heap integrity protections.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-46373?
CVE-2025-46373 is a high-severity memory corruption vulnerability in Fortinet Forticlient, published on 18 Nov 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A Heap-based Buffer Overflow vulnerability [CWE-122] vulnerability in Fortinet FortiClientWindows 7.4.0 through 7.4.3, FortiClientWindows 7.2.0 through 7.2.8 may allow an authenticated local IPSec user to execute arbitrary code or commands via "fortips_74.sys". The attacker would need to bypass the Windows heap integrity protections
Weakness: CWE-122
Which versions are affected by CVE-2025-46373?
It affects 1 product.
Products include Fortinet Forticlient.
How do I fix CVE-2025-46373?
No fix has been published for CVE-2025-46373 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-46373 being exploited?
There is no known exploitation of CVE-2025-46373 in the wild and no public exploit code.
Other vulnerabilities in Fortinet Forticlient
- CVE-2019-17658 Privilege escalation in Fortinet FortiClientWindows
- CVE-2023-45590 Code injection in FortiClientLinux
- CVE-2017-14184 Information disclosure in FortiClient SSLVPN Client for Linux
- CVE-2016-8493 Privilege escalation in Fortinet FortiClient
- CVE-2020-15934 Privilege escalation in FortiClientLinux
Sources
Also known as GHSA-mjrx-5jw9-2x26.