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Google Project Zero reported 58 exploited zero-day vulnerabilities in 2021, a record in the short time the team of security researchers has been keeping tabs.
In a year-in-review report on the number instances a zero-day bug has been exploited in the wild, researchers noted the number a twofold jump in detected flaws since 2020. Google said 25 zero-day bugs in 2020 and 2019.