A remote code execution vulnerability exists when the Windows font library improperly handles specially crafted fonts.For all systems except Windows 10, an attacker who successfully exploited the vulnerability could execute code remotely, aka 'Windows Font Library Remote Code Execution Vulnerability'.
https://www.zerodayinitiative.com/advisories/ZDI-20-877/
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1436