https://www.bleepingcomputer.com/news/microsoft/microsoft-november-2021-patch-tuesday-fixes-6-zero-days-55-flaws/

Today is Microsoft's November 2021 Patch Tuesday, and with it comes fixes for six zero-day vulnerabilities and a total of 55 flaws. The actively exploited vulnerabilities are for Microsoft Exchange and Excel, with the Exchange zero-day used as part of the Tianfu hacking contest.

Microsoft has fixed 55 vulnerabilities with today's update, with six classified as Critical and 49 as Important. The number of each type of vulnerability is listed below: