Microsoft issues Mitigation Tool for an Exchange Server Flaw. The one-click tool can help smaller organizations take quick action to prevent attacks that exploit the unpatched ProxyLogon flaw in on-premises Microsoft Exchange servers. The tool comes with the latest Microsoft Safety Scanner and will automatically mitigate CVE-2021-26855 on any Exchange server on which it is deployed. Microsoft has issued patches for all of the flaws, but at least 10 APT groups have been exploiting the flaws.”]
Source: https://www.databreachtoday.com/microsoft-issues-mitigation-tool-for-exchange-server-flaw-a-16191