I also have this problem. The dashboard seems to be incorrectly recognizing the MX appliances as MS switches with old firmware versions. I checked every MX by hand and verified that each had the minimum firmware version installed that patched this vulnerability. As I was putting in a ticket, I refreshed the dashboard and all the alerts disappeared; however, on the "Organization > Monitor > Firmware Upgrades" page, it still lists the MX appliances as running MS firmware.
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