A remote code execution vulnerability exists in the way that the ChakraCore scripting engine handles objects in memory, aka 'Scripting Engine Memory Corruption Vulnerability'. This CVE ID is unique from CVE-2019-0609, CVE-2019-0680, CVE-2019-0769, CVE-2019-0770, CVE-2019-0771, CVE-2019-0773, CVE-2019-0783.
https://www.zerodayinitiative.com/advisories/ZDI-20-122/
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0639