Microsoft has released its March 2021 quarterly cumulative updates for Exchange Server 2016 and Exchange Server 2019, which include the security updates to address critical flaws that are currently under attack. Microsoft released the emergency patches in response to four previously unknown vulnerabilities that were being exploited by state-sponsored hackers and have since been pounced on by ransomware attackers.
Link: Microsoft Exchange Server: These quarterly updates include fixes for security flaws
via http://www.zdnet.com
