The Microsoft Exchange patches have led to exploitation of major vulnerabilities. What all small and medium sized businesses (SMBs) need to do immediately. The vulnerabilities in question only affect Microsoft Exchange email servers. The attacks were initially attributed to state-sponsored attackers, its likely that a range of different types of attackers — including cybercriminals — are now jumping into this situation. There is a real chance that attackers could use these vulnerabilities for more traditional attacks, like ransomware, to have a crippling impact on your organization.”]
Source: https://blog.avast.com/smbs-immediate-action-microsoft-exchange-vulnerabilities