Today is Microsoft’s March 2021 Patch Tuesday. With today’s update, Microsoft has fixed 82 vulnerabilities, with 10 classified as Critical and 72 as Important. These numbers do not include the 7 Microsoft Exchange and 33 Chromium Edge vulnerabilities released earlier this month. There are also two zero-day vulnerabilities patched today that were publicly disclosed and known to be used in attacks. Administrators should analyze all Exchange servers for attacks that may have occurred before the patches were installed. Microsoft has also updated Microsoft Defender to detect web shells and other IOCs associated with these attacks.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-march-2021-patch-tuesday-fixes-82-flaws-2-zero-days/