Buffer overflow in Fortinet FortiClient for Windows - CVE-2026-70465
Published: August 13, 2026
Vulnerability identifier: #VU142459
CSH Severity: High
CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-70465
CWE-ID: CWE-120
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
The vulnerability exists due to buffer overflow in kernel driver due to missing size validation. An unauthenticated attacker in a position can alter or craft DNS responses to the targeted host to execute arbitrary code via malicious packets.
Affected software
Fortinet FortiClient for Windows
How to mitigate CVE-2026-70465
Install update from vendor's website.
Fortinet FortiClient for Windows - addressed in versions 7.2.12, 7.4.4