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On 19 July 2024, American [[cybersecurity]] company [[CrowdStrike]] distributed a faulty update to its security software that caused
The outage disrupted disrupted businesses and governments around the world. Affected industries included [[Airline|airlines]], [[Airport|airports]], [[Bank|banks]], [[Hotel|hotels]], [[Hospital|hospitals]], [[manufacturing]], [[Stock market|stock markets]], [[broadcasting]], and more. [[Public service|Governmental services]], such as [[Emergency service|emergency services]] and [[Website|websites]], were also heavily affected.<ref>{{Cite web |last1=Godfrey |first1=Paul |last2=Druker |first2=Simon |last3=Wynder |first3=Ehren |date=19 July 2024 |title=911 call centers back online after IT outage causes global chaos |url=https://www.upi.com/Top_News/World-News/2024/07/19/IT-failure-hits-causes-chaos-around-world/2531721376791 |access-date=19 July 2024 |website=United Press International |language=en}}</ref><ref name="ABC News--240719b">{{Cite news |date=19 July 2024 |title=Live: 'Completely unprecedented' outage causes havoc with IT systems across globe |url=https://www.abc.net.au/news/2024-07-19/global-it-outage-crowdstrike-microsoft-banks-airlines-australia/104119960 |access-date=19 July 2024 |work=ABC News |language=en-AU}}</ref> The worldwide financial damage has been estimated to range in the billions of dollars.<ref>{{Cite web |last=Purdy |first=Kevin |date=19 July 2024 |title=Major outages at CrowdStrike, Microsoft leave the world with BSODs and confusion |url=https://arstechnica.com/information-technology/2024/07/major-outages-at-crowdstrike-microsoft-leave-the-world-with-bsods-and-confusion/ |access-date=20 July 2024 |website=Ars Technica |language=en-us}}</ref><ref name="v983">{{cite web |last=Field |first=Matthew |date=19 July 2024 |title=What is CrowdStrike? The $80bn IT giant behind Friday's global meltdown |url=https://www.telegraph.co.uk/business/2024/07/19/what-is-crowdstrike-80bn-it-giant-behind-global-meltdown/ |archive-url=https://web.archive.org/web/20240719214250/https://www.telegraph.co.uk/business/2024/07/19/what-is-crowdstrike-80bn-it-giant-behind-global-meltdown/ |archive-date=19 July 2024 |access-date=20 July 2024 |website=The Telegraph}}</ref>
Within hours, the error was discovered and a [[Patch (computing)|fix]] was released,<ref name="NDTV.com-240719">{{Cite web |title=In 1st Statement After Outage, CrowdStrike CEO Says... |url=https://www.ndtv.com/world-news/fix-deployed-ceo-of-firm-behind-global-microsoft-outage-6140433 |access-date=19 July 2024 |website=NDTV.com}}</ref> but because each affected computer had to be manually fixed,<ref name="Browne-240719">{{Cite web |last=Browne |first=Ryan |date=19 July 2024 |title=How a software update caused one of the world's biggest IT blackouts |url=https://www.cnbc.com/2024/07/19/what-is-crowdstrike-crwd-and-how-did-it-cause-global-it-outages.html |access-date=19 July 2024 |website=CNBC |language=en}}</ref> outages lingered on many services.<ref>{{Cite web |last=Fung |first=Brian |date=19 July 2024 |title=Recovering from the global tech outage could be a long, arduous process |url=https://www.cnn.com/2024/07/19/business/recovery-global-crowdstrike-outage/index.html |access-date=20 July 2024 |website=CNN |language=en}}</ref><ref>{{Cite web |date=20 July 2024 |title=Microsoft IT outage live: Total recovery from CloudStrike failure 'could take weeks' amid more flight delays |url=https://www.yahoo.com/news/microsoft-outage-live-crowdstrike-boss-170429333.html |access-date=20 July 2024 |website=Yahoo News |language=en-US}}</ref>
The outage raised questions about [[oligopoly]] and centralization in the information technology sector.<ref>{{cite news |title=Serious questions to answer after what could be the biggest IT outage in history |url=https://news.sky.com/story/microsoft-has-serious-questions-to-answer-after-what-could-be-the-biggest-it-outage-in-history-13180962 |work=Sky News |language=en}}</ref><ref name="centralization"/> The majority of the world's computers use Microsoft Windows, creating a [[monoculture]] that reduces resiliency.<ref name="CBC" /><ref name="centralization">{{cite news |title=Major Microsoft outage: Numerous sectors hit in worldwide “Digital Pandemic” |url=https://www.openaccessgovernment.org/major-microsoft-outage-numerous-sectors-hit-in-worldwide-digital-pandemic/ |access-date=21 July 2024 |date=July 19, 2024}}</ref> [[Ciaran Martin]] said that "This is a very, very uncomfortable illustration of the fragility of the world's core internet infrastructure".<ref name="CBC" /> Security experts advocated more [[Redundancy (engineering)|redundancy]], to avoid [[single points of failure]],<ref>{{cite news |title=Serious questions to answer after what could be the biggest IT outage in history |url=https://news.sky.com/story/microsoft-has-serious-questions-to-answer-after-what-could-be-the-biggest-it-outage-in-history-13180962 |work=Sky News |language=en}}</ref> wider use of decentralized and heterogenous [[Federation (information technology)|federated]] systems,<ref name="centralization"/> and public anger at the failure of political leaders to regulate for diversity and competition.<ref name="CBC" /> Mandating disclosure of breaches and vulnerabilties has also been suggested.<ref>{{cite news |title=Lesson from global Microsoft outage: Need for greater regulation and accountability |url=https://indianexpress.com/article/opinion/columns/global-microsoft-outage-9465182/ |work=The Indian Express |date=20 July 2024 |language=en}}</ref>
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