Jack Lester scored two as Chesterfield came from behind to claim their first home league victory since October.
Exeter took the lead on 17 minutes when Dean Moxey netted a 20-yard free-kick.
Lester had two good chances to equalise either side of half-time but found the net in the 68th minute after he was put in the clear by Lloyd Kerry.
Exeter's Steve Basham missed a penalty after handball by Aaron Downes and Lester sealed the win on 80 minutes when he beat the offside trap again.
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Booked: Downes, Lester.
Goals: Lester 68, 80.
Exeter: Jones, Archibald-Henville (Taylor 60), Edwards, Seaborne, Tully, Gill, Harley, Panther (Sercombe 46), Moxey, Logan, McAllister (Basham 69). Subs Not Used: Marriott, Saunders.
Goals: Moxey 17.
Att: 2,894
Ref: Clive Oliver (Northumberland).
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