Today is Microsoft’s April 2021 Patch Tuesday, and with it comes five zero-day vulnerabilities and more Critical Microsoft Exchange vulnerabilities. With today’s update, Microsoft has fixed 108 vulnerabilities, with 19 classified as Critical and 89 as Important. There are five vulnerabilities patched today that were publicly disclosed, with one known to be used in attacks. Microsoft also fixed four critical Microsoft Exchange..vulnerabilities..that the NSA..discovered..and one actively exploited. The NSA also discovered four more Critical remote code execution vulnerabilities.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-april-2021-patch-tuesday-fixes-108-flaws-5-zero-days/