There have been some news items floating around the Internet discussing a weakness in the ANSI X9.31 random number generator (RNG) known as DUHK (for Don’t Use Hard-coded Keys) that had affected older FortiGate devices. An update was issued more than a year ago when the flaw was first announced to Fortinet.
Article Link: https://blog.fortinet.com//2017/10/25/the-duhk-vulnerability