Microsoft has released patches for a Windows bug that is being exploited in the wild and for four new Exchange vulnerabilities.
There are still nearly 30,000 Exchange servers vulnerable to the ProxyLogon bug, with ransomware attacks and public exploits circulating.
Microsoft has published a new tool that installs a mitigation for the CVE-2021-26855 Exchange ProxyLogon flaw.
The number of Exchange servers vulnerable to the ProxyLogon flaws is continuing to drop, but there are still more than 60,000 online.
Attackers are installing the DearCry ransomware on some vulnerable Exchange servers.