An elevation of privilege vulnerability exists in the way that the dssvc.dll handles file creation allowing for a file overwrite or creation in a secured location, aka 'Windows Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2019-1422, CVE-2019-1423.
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1420