Symptoms

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.

Cause

This issue may occur because of regex matching when noderunner.exe parses an attachment, such as a Word document, in an email message.

Resolution

To fix this issue, install Cumulative Update 11 for Exchange Server 2013.

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

References

Learn about the terminology that Microsoft uses to describe software updates.

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