The hosts took the lead in the 34th minute when striker Keinan Davis was presented with a tap-in after Hassane Kamara’s low cross.
Defender Aji Alese then drew Tony Mowbray’s side level on the stroke of half-time after his effort sneaked over the line.
Watford started strongly in the second half and retook the lead when Luke O’Nien headed the ball into his own net, yet Black Cats substitute Jewison Bennette scored a dramatic equaliser three minutes from time.
Our Sunderland writer Phil Smith has dished out his player ratings from Vicarage Road:
13. Leon Dajaku (sub) - 6
Caused Watford real problems and provided an outlet, but will know he should have taken a massive chance to equalise. Thankfully, Bennette scored moments later. 6 Photo: Frank Reid
14. Jewison Bennette (sub) - 8
What. A. Moment. Looked bright the other night and again here, driving into dangerous areas. Took his goal with remarkable composure, sparking absolute delirium in the away end. 8 Photo: SAFC
15. Jay Matete (sub) - 7
Good energy to break up the play and drive forward. 7 Photo: FRANK REID PHOTOGRAPHER 2022
16. Abdoullah Ba
Looks a very talented player, handled the ball well and wasn’t afraid to drive forward. 7 -- Photo: National World