Today is Microsoft’s December 2019 Patch Tuesday, which means it is your job to be nice to Windows administrators everywhere and not to take it personal if they are a bit grouchy today. With the release of the December 2019 security updates, Microsoft has released 2 advisories and updates for 36 vulnerabilities. Of these vulnerabilities, 7 are classified as Critical, 27 as Important, 1 as Moderate and 1 as Low. One of the ‘Important’ vulnerabilities fixed today is a zero-day privilege elevation vulnerability that was discovered being actively exploited in the wild.
Source: https://www.bleepingcomputer.com/news/microsoft/microsofts-december-2019-patch-tuesday-fixes-win32k-zero-day-36-flaws/