Microsoft Exchange Server: Guidance on Protecting your Data against Vulnerabilities

March 11, 2021
A security vulnerability was recently discovered in Microsoft Exchange Server. According to Microsoft, this zero-day vulnerability is being exploited by a nation-state affiliated group. The vulnerabilities exist in on-premises Exchange Servers 2010, 2013, 2016, and 2019 and Exchange Online is not affected.
To minimize or to avoid the impacts of this situation, Microsoft highly recommends taking immediate action to apply patches for any on-premises Exchange deployments. The priority should be placed on servers which are accessible from the Internet (e.g., servers publishing Outlook on the web/OWA and ECP). 
To patch these vulnerabilities, Microsoft is recommending moving to the latest Exchange Cumulative Updates and then installing the relevant security updates on each Exchange Server. 
  • You can use the Exchange Server Health Checker script, which can be downloaded from GitHub (use the latest release).
  • Running this script will tell you if you are behind on your on-premises Exchange Server updates (note that the script does not support Exchange Server 2010). 
  • We also recommend that your security team assess whether or not the vulnerabilities were being exploited by using the Indicators of Compromise Microsoft.
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