An information disclosure vulnerability in Fortinet FortiOS 5.6.0, 5.4.4 and below versions allows attacker to get FortiOS version info by inspecting FortiOS IKE VendorID packets.
A read-only administrator on Fortinet devices with FortiOS 5.2.x before 5.2.10 GA and 5.4.x before 5.4.2 GA may have access to read-write administrators password hashes (not including super-admins) stored on the appliance via the webui REST API, and may therefore be able to crack them.