CVE-2026-70465: Fortinet FortiClient

High severity, CVSS 8.1. EPSS: 0.5% chance of exploitation in the next 30 days.

A buffer copy without checking size of input ('classic buffer overflow') vulnerability in Fortinet FortiClientWindows 7.4.0 through 7.4.3, FortiClientWindows 7.2.0 through 7.2.11 may allow an unauthenticated attacker in a position to alter or craft DNS responses to the targeted host to execute arbitrary code via malicious packets.

Affected products

• Fortinet FortiClient: from 7.2.0, before 7.2.12 (fixed in 7.2.12); from 7.4.0, before 7.4.4 (fixed in 7.4.4)

Published 2026-08-12. Last modified 2026-09-08.