Apply Microsoft April 2021 Security Update to Mitigate Newly Disclosed Microsoft Exchange Vulnerabilities

Original release date: April 13, 2021Microsoft's April 2021 Security Update mitigates significant vulnerabilities affecting on-premises Exchange Server 2016 and 2019. An attacker could exploit these vulnerabilities to gain access and maintain persistence on the target host. CISA strongly urges organizations to apply Microsoft's April 2021 Security Update to mitigate against these newly disclosed vulnerabilities. Note: the Microsoft security updates released in March 2021 do not remediate against these vulnerabilities. In response to these the newly disclosed vulnerabilities, CISA has issued Supplemental...