Blog Post

Exchange Team Blog
3 MIN READ

Released: May 2021 Exchange Server Security Updates

The_Exchange_Team's avatar
The_Exchange_Team
Icon for Microsoft rankMicrosoft
May 11, 2021
Microsoft has released security updates for vulnerabilities found in: Exchange Server 2013 Exchange Server 2016 Exchange Server 2019 These updates are available for the following specific...
Updated May 12, 2021
Version 6.0
announcements
Exchange 2013
exchange 2016
exchange 2019
hybrid
on premises
security
DaveShackelford's avatar
DaveShackelford
Copper Contributor
May 13, 2021

So far I've seen two Exchange servers (both 2016) at unrelated organizations in the last 24 hours that have run this update and then had this problem:

Information Store won't start.
AD Topology Service won't stop.

None of the relevant services were disabled--they just wouldn't start or stop.
Problems starting other services like Service Host.

The only fix was to restore from backup and block the patch.
In the environment I had direct access to, they were running Avast and Huntress on the server.

Are other people seeing this?