The site was affected just before the beginning of the opening ceremony in Pyeongchang, South Korea.
TV and internet systems at the Games were also disrupted, though operations were restored about 12 hours later.
However, a spokesman said that the International Olympic Committee would not be commenting on who might have been behind the incident.
"Maintaining secure operations is our purpose," said Mark Adams.
He added that the issue was being dealt with but that he was not aware who had carried out the attack.