Faulty software update triggers global IT outage
A flawed update from the cybersecurity firm CrowdStrike crashed millions of Windows computers worldwide, grounding flights and disrupting hospitals and banks.
A faulty software update from the cybersecurity company CrowdStrike caused one of the largest IT outages in history on Friday, crashing millions of computers running Microsoft Windows around the world and disrupting airlines, hospitals, banks, broadcasters and government services.
The problem began overnight when CrowdStrike pushed out an update to its widely used security software that contained a defect, causing affected machines to crash into the dreaded "blue screen of death" and fail to restart normally. Because the software is deeply embedded in critical systems at large organisations, the effects rippled across entire industries almost simultaneously.
Airlines were among the hardest hit, grounding or delaying thousands of flights as check-in and scheduling systems failed, stranding travellers at airports worldwide. Hospitals postponed procedures, payment systems faltered, and some emergency services and broadcasters were knocked offline.
CrowdStrike identified the cause and issued a fix within hours, but because many affected machines had to be repaired individually and manually, the recovery stretched on for days. The company's chief executive apologised and stressed that the outage was not the result of a cyberattack.
The episode was a dramatic illustration of how dependent the modern world has become on a small number of software providers, and how a single flawed update could cascade into global chaos. It prompted calls for greater resilience and scrutiny of the concentration of critical digital infrastructure.