Trident Blog

Windows security update can cause computers running Sophos Endpoint on select O/S versions to fail or hang on reboot

Nathan Wood - Friday, April 12, 2019
Microsoft has released security updates that are impacting some security AV vendors, causing some of their customers using Windows 7, Windows 8.1, Windows 2008 R2, and Windows 2012 to occasionally experience system fails or hangs during boot up after application of the update. 

A small number of Sophos customers have reported experiencing this issue. Sophos is working very closely with Microsoft to resolve the issue. Microsoft has introduced a temporary block to stop computers not already affected from applying the latest Windows security update. Additionally, we have a work around for those impacted customers.

How do I know if my customer is impacted?
To be impacted, customers must meet all the criteria below. If they do not meet all the criteria, then they are not impacted. 

1. Running Windows 7, Windows 8.1, Windows 2008 R2, or Windows 2012

2. Running any Sophos Windows endpoint or server product except Sophos Central Intercept X. (Note: this does impact Intercept X Advanced and Intercept X Advanced with EDR.)

3. Have applied the latest Windows security update and have rebooted after the update is complete

Important note: If customers have not yet rebooted, they should uninstall the latest Microsoft security update before rebooting

As the majority of Sophos customers do not seem to be affected, it is possible that during the ongoing investigation additional criteria will be added to further limit the scope of impacted customers. The Sophos Knowledge Base
will continue to be updated with the latest information. 

What can you do if you are being impacted?
The latest information about this issue and remediation steps are documented in Sophos Knowledge Base

We are notifying all Sophos Endpoint customers via email to inform them of this situation. The Sophos Knowledge Base will continue to be updated with the latest information. 

If you are having any issues, please contact your account manager. 


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