The move leaves a roster spot open on the practice squad.
The 49ers made Harris a sixth-round selection out of Florida last year. He registered 34 combined tackles through eight games and five starts with the 49ers in 2018.
The Minnesota Vikings made Exum a sixth-round selection out of Virginia Tech in 2014. He registered two combined tackles through three games with the 49ers this year. Exum has recorded 64 combined tackles, a sack, seven passes defensed, an interception, a touchdown, and two forced fumbles through his five NFL seasons.
San Francisco initially signed Exum on November 7, 2017.
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