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441:Waikato District Health Board ransomware attack
340:Health Service Executive ransomware attack
316:2021 Microsoft Exchange Server data breach
204:Computer companies disestablished in 2021
293:This list may not reflect recent changes
352:Ivanti Pulse Connect Secure data breach
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158:For more information, see
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412:Silver Sparrow (malware)
328:2021 Facebook outage
311:2021 FBI email hack
470:2021 in technology
465:2020s in computing
460:Computing by year
160:2021 in computing
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388:Log4Shell
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