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Advisory: Microsoft has released out-of-band security updates to address four vulnerabilities in Exchange Server

Microsoft has released out-of-band patches to address four vulnerabilities in Microsoft Exchange Server. The vulnerabilities impact on-premises Microsoft Exchange Servers and are not known to impact Exchange Online or Microsoft 365 (formerly O365) cloud email services.

The US Government's Cybersecurity and Infrastructure Security Agency has issued guidance

https://us-cert.cisa.gov/ncas/alerts/aa21-062a