Falcon Sensor is one of the most popular security products in Windows servers. Practically every large company purchases Crowdstrike services to protect their servers.
People who aren’t affected:
Linux and Mac servers
Private individuals and smaller businesess who have Windows machines that don’t buy CrowdStrike services.
Companies that bothered to create proper test environments for their production servers.
People who are affected:
Companies that use Windows machines, buy Falcon Sensor from Crowdstrike, and are too stupid/cheap to have proper update policies.
In terms of numbers, we don’t know how many people are affected or how much it will cost. A lot. Globally. Flights were grounded, surgeries rescheduled, bank transfers and payments interrupted, and millions of employees couldn’t turn on their computers this morning.