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  2. 2021 Microsoft Exchange Server data breach - Wikipedia

    en.wikipedia.org/wiki/2021_Microsoft_Exchange...

    Hackers took advantage of four separate zero-day vulnerabilities to compromise Microsoft Exchange servers' Outlook Web Access (OWA), giving them access to victims' entire servers and networks as well as to emails and calendar invitations, only at first requiring the address of the server, which can be directly targeted or obtained by mass ...