An insufficient session expiration vulnerability in FortiNet's FortiIsolator version 2.0.1 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)
Fortinet
Exploit
CVE-2020-6649
NVD
Update to v2.0.1 | Fortinet PSIRT Advisory