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Microsoft has released Exchange On-Premises Mitigation Tool (EOMT), which quickly performs the initial steps for mitigating the ProxyLogon flaw (CVE-2021-26855) on any Exchange server and attempts to remediate found compromises.
“This tool is not a replacement for the Exchange security update but is the fastest and easiest way to mitigate the highest risks to internet-connected, on-premises Exchange Servers prior to patching,” Microsoft explained.