A remote code execution vulnerability exists in the way that ActiveX Data Objects (ADO) handle objects in memory, aka 'ActiveX Data Objects (ADO) Remote Code Execution Vulnerability'.
https://www.tenable.com/blog/tenable-roundup-for-microsofts-june-2019-patch-tuesday
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0888