Are you a WSUS-admin and "timely-patcher"? You might have noticed that your servers didn't restart after yesterday's patchday, since Microsoft had problems with WSUS-synchronization. Updates didn't arrive in time on your WSUS and thus, might not be installed, yet. There are several critical updates, see https://www.zerodayinitiative.com/blog/2021/5/11/the-may-2021-security-update-review

So you might want to verify that these get installed as soon as possible.
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