Oesterle was placed on waivers by the Bruins on Friday, Elliotte Friedman of Sportsnet reports.
Oesterle joined Boston on a two-year, two-way contract with the Bruins in early July. If he clears waivers, he'll head to AHL Providence, where he'll likely spend most of the season. The 32-year-old made 22 regular-season appearances for Calgary last year and recorded two assists, 18 shots and 33 blocked shots while averaging 13:31 of ice time.