May 2022 Security Update
In order to protect against CVE-2022-21978 within your environment
/PrepareDomain must be run against each domain that contains the MESO container within it.
Health Checker will query all the domains in the environment to see if it has a MESO container. If it does, it checks for a particular ACE or version number of the MESO container to see if we are secure. If we don't pass this check, it will provide what domains you need to run
In order to protect your environment from CVE-2022-21978, you must install the May 2022 SU or a newer SU/CU that contains this security fix. All SUs and CUs after May 2022 contain this fix. After you have installed this security fix, you must run
/PrepareAllDomains from the Exchange bin directory.
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Exchange Team Blog - May SU 2022