How Routine CrowdStrike Update Crashed the World’s Computers (1)

When Brendan Delaney, a doctor with the UK’s National Health Service, turned up at his London clinic on Friday, he was expecting a busy day seeing patients.

It had been two months since a devastating cyberattack had affected hospitals and clinics in southeast London. And doctors like Delaney, who’s also a professor at Imperial College London, were finally beginning to feel a return to normalcy. They could send off urgent blood tests again, and cybersecurity experts were making progress repairing and replacing information technology systems that had previously been shut down by a criminal hacker gang.

But just as he ...