Tomas Soucek pulled one back for West Ham in the 49th minute when he guided home Malick Diouf’s pass from close range.
In the 70th minute, Cucurella equalised for Chelsea when he lunged to nod home a loose ball inside the West Ham 18-yard box.
Crysencio Summerville scored his first goal in a West Ham shirt.
The Red Devils were humiliated 2-0 at London Stadium, suffering their 8th defeat in the league this season.
The blues of Manchester United continue as New Castle United knock them out of the Carabao Cup
The result leaves Arsenal, who are currently on 74 points, only four points ahead of defending champions Manchester City who still have a game in hand.
Bowen’s 56th minute goal for West Ham made the Hammers the first EPL side to score two goals against Chelsea this season.
