A poor defensive display saw Hereford concede three in the first half after Jason Cowley put the hosts ahead.
But a second half comeback, including Andy Williams, Kieran Phillips and Adam Rooney for Lassana Mendes, Lewis Hudson and Yusifu Ceesay, saw the Bulls earn a point.
An Alex Babos goal reduced the deficit to one before Aaron Skinner scored an equaliser in injury time.