CVE-2021-24019: Fortinet FortiClient Endpoint Management Server

Critical severity, CVSS 9.8. EPSS: 3.9% chance of exploitation in the next 30 days.

An insufficient session expiration vulnerability [CWE- 613] in FortiClientEMS versions 6.4.2 and below, 6.2.8 and below may allow an attacker to reuse the unexpired admin user session IDs to gain admin privileges, should the attacker be able to obtain that session ID (via other, hypothetical attacks)

Affected products

• Fortinet FortiClient Endpoint Management Server: before 6.2.9 (fixed in 6.2.9); from 6.4.0, before 6.4.2 (fixed in 6.4.2)

Published 2021-10-06. Last modified 2026-06-17.