CrowdStrike CEO George Kurtz said the tech outage that has impacted systems across the globe was caused by a software bug in a system update, creating issues within Microsoft's Windows operating system. Kurtz said on NBC's Today show Friday the company has resolved the issue and the focus now is "recovering systems that are out there." "As systems come back online as they're rebooted, they're working," Kurtz said. "Now we're working with each and every customer to make sure we can bring them back online."