October 2021 Exchange Server Security Updates

Microsoft has released security updates for vulnerabilities found in:

  • Exchange Server 2013 CU23 (Exchange 2013 customers might also need to /prepareschema. Please see this post.)
  • Exchange Server 2016 CU21 and CU22
  • Exchange Server 2019 CU10 and CU11

For full details refer to this article.

Summary of updates:

 

Be sure to visit Messageware Security Products for Microsoft Exchange Server. All enterprises with Exchange Servers should add security that provides on-premise systems with logon intelligence and security controls protecting the most widely used Exchange Server services, including OWA / Outlook Web, ECP, Autodiscover, ActiveSync, EWS, OAB, MAPI, Outlook Anywhere. Critical additions for all enterprises including those who believe they are protected by multi-factor authentication (MFA/2FA).