Multiple threat actors, including Hafnium, LuckyMouse, Calypso, Winnti, Bronze Butler, Websiic, Tonto, Mikroceen, and DLTMiner, are actively targeting four zero-day Microsoft Exchange vulnerabilities (CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, CVE-2021-27065) in their targeted [more]

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