Jahad Thomas, Isaac White and Matt Harris each scored 14 points, Tyler Livingston had 12 points and Ryan Jones added 10 for UMass-Lowell (7-11, 3-2 America East). Thomas grabbed nine rebounds and Harris hit four 3-pointers.
Dre Wills scored eight points, including a pair of 3-point plays, during a 10-0 run that pulled Vermont (10-9, 2-2) within two with four minutes left.
The River Hawks made 15 of 16 free throws, including eight by Primerano, from there to seal it. They finished shooting 49.1 percent (28 of 57) from the field, including 10 3-pointers, and made a season-high 27 from the foul line on 32 attempts.
Dre Wills scored a career-high 22 points for Vermont, which hit just 4 of 17 from 3-point range.
UMass-Lowell committed a season-low seven turnovers.