Substitute Simon Cox sparked a late revival with a superb finish, brilliantly lobbing Jack Butland.
And when fellow sub Dan Harding’s shot deflected off Blues’ Pablo Ibanez, Forest were saved.
Hayden Mullins (69) and Marlon′King (71) had put Birmingham 2-0 up two minutes before Cox sparked the fightback.
Forest boss Sean O’Driscoll said: “We didn’t deserve to be two down and it was a good response, and our three subs did well. ”
Blues’ boss Lee Clark said: “A point is not a bad result but when you get yourself 2-0 up, you are not satisfied with a point.”
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