16 of the security updates are listed as critical, 38 are rated important, one is rated moderate, and one is low in severity. The updates address security flaws in Windows, Office, Internet Explorer, Edge, ChakraCore, ASP.NET, and the.NET Framework. A zero-day vulnerability (CVE-2018-0802) in MS Office related to a 17-year-old vulnerability in the Equation Editor functionality (EQNEDT32.EXE) has been actively exploited by several threat groups in the wild.
Source: https://thehackernews.com/2018/01/microsoft-security-patch.html