Microsoft recently announced there were some vulnerabilities in the Exchange software that were being exploited by cybercriminals. Soon after, the company released emergency patches for Exchange Server 2019, Server 2016 and Server 2013. In addition to this, Microsoft rolled out a handful of mitigation tools and updated Microsoft Defender Antivirus to combat such vulnerabilities. The Check Point Research report revealed 32 firms worldwide were targeted via these vulnerabilities.
source https://www.firstpost.com/tech/news-analysis/microsoft-exchange-vulnerabilities-affected-banking-finance-sectors-the-most-report-9475841.html