How to patch Exchange Server for the Hafnium zero-day attack

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Administrators who run on-premises Microsoft Exchange Server woke up on March 2 to a rude awakening: Some of them now have incidents to investigate. Starting on February 28 and possibly earlier, Exchange Servers were targeted in a widespread attack that relied on leveraging a zero-day server-side request forgery (SSRF) vulnerability. Microsoft has attributed the attack to Hafnium, a Chinese APT group.

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