Microsoft Release Patches for On-Premises Exchange Servers
News|3 March 2021
Microsoft has released patches for multiple on-premises for Microsoft Exchange Server zero-day vulnerabilities that are being exploited by a nation-state affiliated group.
The vulnerabilities exist in on-premises Exchange Servers 2010, 2013, 2016, and 2019. Exchange online is not affected.
To minimise and avoid the impacts of this situation, Microsoft highly recommends that you take immediate action to apply the patches for any on-premises Exchange deployments. Either managed by yourselves or that you are managing for customers. The priority should be servers that are accessible from the internet (e.g. servers publishing Outlook on the web/OAW and ECP).
To patch these vulnerabilities, you should move to the latest Exchange Cumulative Updates and then install 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 we shared here.
You can access Microsoft’s Security Update Release relating to this issue here.
Contact Grey Matter
If you have any questions or want some extra information, complete the form below and one of the team will be in touch ASAP. If you have a specific use case, please let us know and we'll help you find the right solution faster.
By submitting this form you are agreeing to our Privacy Policy and Website Terms of Use.
Related News
We attend CyberSmart Live
Helping ensure you’re using the best tools for your business and technical needs is important to us. That’s why keeping our team on top of the latest trends, learning about product updates and improving partnerships are integral. This week we...
The Developer’s Guide to Leveraging DevOps and Cloud Solutions
We’ve found implementing DevOps practices to have been a key aim for our customers so far in 2025. And there’s no better way to implement better DevOps practices than to leverage cloud services. In fact, according to Google Cloud’s State...
InstallShield free trial links
Looking to download an InstallShield free trial? You’ve come to the right place. We’ve also provided a breakdown of what InstallShield is and what’s included in each of the editions. What is InstallShield? Revenera InstallShield is a software tool for...
Data science in 2025: Beyond the LLM hype
Has AI killed data science? In this episode of our podcast (Grey Matter Talks Tech), we welcome data science expert, Dr Jodie Burchall to tell us about the current landscape of data science in 2025, looking beyond the headlines dominated...