With that said, let me save you the trouble of parsing the table and tell you straight that 200B models are capped at fimrware branch 5.2, the latest version of which is 5.2.15, and that one is still affected. The 5.2 branch reached complete end of support four years ago, so there's no chance that it will ever receive a patch for this. (the HW itself is EOS for 2,5 years already as well)
pminarik has given you excellent info. Your best course of action is a new FortiGate. A FortiGate 100F could easily replace the 200B in terms of performance in a 19" rackmount form factor. Even the entry-level desktop form factor models could replace this easily at an even lower price point and you can get rack mount kits for them.
Support for 200B has expired on 1st April 2020 and for OS 5.2 on 13rd December 2018, therefore, this vulnerability patch won't be provided for these hardware/software. You are welcome to contact your account manager/sales engineer to replace the fortigate with active support to mitigate this issue.
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