The Vikings (4-0) jumped out to a 14-2 lead, with Montgomery hitting back-to-back 3-pointers in an 18-second span, and led 30-21 at halftime.
The Golden Flashes (2-1) closed to within four points at 44-40 with 5:33 left, but Brown answered with a 3-pointer from the right wing with 4:03.
Kent State again threatened, getting to 52-47 with 1:12 left, but the Vikings hit 5 of 8 free throws to seal the win.
Cleveland State held the Golden Flashes to 35.2 percent shooting from the field (19 of 54), including 1 of 17 from 3-point range, and forced 22 turnovers.
The Vikings have forced at least 20 turnovers in all four games this year.