The visitors fell behind in the 19th minute when Jack Rudoni’s cross hit Callum Doyle’s arm and referee Simon Mather awarded a penalty.
Sunderland drew level 10 minutes before half-time when Alex Pritchard curled home another excellent free-kick, his second goal in as many games.
McCormick was then sent off after receiving a second yellow card.
Our chief SAFC writer Phil Smith has delivered his verdict on how each player fared at Plough Lane:
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1. Anthony Patterson - 6
Made one or two very good saves and just about came through a stern examination on set pieces. 6 Photo: JPI Media
2. Trai Hume - 5
Put in a couple of excellent early crosses which showed his quality, but was a little tentative at times and showed his inexperience occasionally. 5 Photo: FRANK REID PHOTOGRAPHER 2022
3. Bailey Wright - 7
Made a very assured return to the side, not putting a foot wrong defensively in a solid showing. 7 Photo: JPI Media
4. Callum Doyle - 6
Punished with a very harsh handball decision, when he was at best a yard away from the ball. Solid otherwise, keeping it simple and effective. 6 Photo: Frank Reid