The Bills waived Brown on Sunday, Chris Brown of the Bills Radio Network reports.
Brown was signed by Buffalo on Monday after Mitch Trubisky sustained a knee injury. Brown completed 11 of 12 passes for 102 yards in Saturday's preseason game against the Panthers, but the Bills will let him go in favor of Ben DiNucci. Assuming he clears waivers, Brown will look to catch on with another team as a practice squad/emergency quarterback.