Assume that you use SQL Server 2017 Analysis Services (SSAS). When you execute an MDX query that references certain MDX functions, SSAS may crash, and you receive an access violation error message.
This fix is included in Cumulative Update 4 for SQL Server 2017.
About SQL Server 2017 builds
Each new build for SQL Server 2017 contains all the hotfixes and security fixes that were in the previous build. We recommend that you install the latest build for SQL Server 2017.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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