CVE-2016-7541 in FortiOS
Summary
Long lived sessions in Fortinet FortiGate devices with FortiOS 5.x before 5.4.0 could violate a security policy during IPS signature updates when the FortiGate's IPSengine is configured in flow mode. All FortiGate versions with IPS configured in proxy mode (the default mode) are not affected.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.