Microsoft Discovers Multiple Zero-Day Exploits Being Used to Attack Exchange Servers

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On March 2, 2021, Microsoft released four out-of-cycle security updates for on-premises Microsoft Exchange Servers to address vulnerabilities that have been exploited in limited and targeted attacks by a previously unknown Chinese espionage group. Given the nature of the threat, organizations should take proactive steps to apply these security updates immediately to affected systems and should also evaluate their incident response function to ensure an appropriate level of vigilance.

In this Flash Report, we recap Microsoft’s new security updates and outline four steps organizations should take to prepare for and respond to the evolving threats posed by zero-day vulnerabilities.

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