Accidental Foul
RulesAn unintentional illegal action such as a headbutt or low blow. If a fight is stopped early due to an accidental foul, scorecards go to the judges if enough rounds have been completed.
Rules Guide
Boxing Rules: Scoring, Fouls & Weight Classes
How this fits with the rest of the rules — the 10-point must system, fouls and penalties, and every weight class.