Munster are 15-points behind Guiness PRO-14 Conference A leaders Glasgow after seeing a 17-point lead slip against Ulster last night.
Two tries from Niall Scannell and a penalty try had seen the Reds go 17-nil in front at Kingspan Stadium before Sam Arnold received a straight red card with 21-minutes to go.
Craig Gilroy scored two tries and Darren Cave and Robert Lyttle also crossed the whitewash as Ulster secured a bonus-point 24-17 victory.
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The win keeps Ulster in third place in Conference B.
Former Leinster and Connacht out-half Andy Dunne feels Munster threw it away: