On 19 July 2024, a single flawed software update took down an estimated 8.5 million Windows devices worldwide. In the UK, GP surgeries lost access to patient records and appointment systems, train departure boards went blank during the morning rush, airports cancelled flights, and small businesses were pushed onto cash-only tills when card payment systems stopped working. None of it was a cyber attack. It was one third-party update, cascading into services that had never been mapped as depending on it.
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