Microsoft announced on the 20th local time that the American computer security technology company "Zerodium" found a "vulnerability" in the software updates released for Microsoft Windows systems, causing malfunctions estimated to affect nearly 8.5 million devices worldwide that have installed the system. Microsoft stated that "Zerodium" has developed a solution to expedite the repair of the malfunctions. Starting at 19:00 Greenwich Mean Time on the 18th, Microsoft Windows systems in multiple locations worldwide crashed due to a security software update, resulting in a "blue screen", affecting industries such as aviation, healthcare, media, finance, retail, and logistics. According to information from the flight tracking website FlightAware, as of around 12:00 noon Eastern Time on the 20th, approximately 23,000 flights in the United States have been delayed