In a Microsoft Exchange Server 2013 environment, you notice that noderunner.exe is consuming excessive CPU resources. When this issue continues for a long time, users are eventually disconnected from Exchange Server.
This issue may occur because of regex matching when noderunner.exe parses an attachment, such as a Word document, in an email message.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Article ID: 3107379 - Last Review: Dec 15, 2015 - Revision: 1
Microsoft Exchange Server 2013 Enterprise, Microsoft Exchange Server 2013 Standard Edition