Microsoft has released important “Patch Tuesday” monthly security updates. These should applied promptly as some of these vulnerabilities have potential to be actively exploited in-the-wild later:

https://isc.sans.edu/forums/diary/Microsoft+May+2021+Patch+Tuesday/27408/

https://blog.talosintelligence.com/2021/05/microsoft-patch-tuesday-for-may-2021.html

https://www.zerodayinitiative.com/blog/2021/5/11/the-may-2021-security-update-review

https://us-cert.cisa.gov/ncas/current-activity/2021/05/11/microsoft-releases-may-2021-security-updates

https://msrc.microsoft.com/update-guide/releaseNote/2021-May

https://patchtuesdaydashboard.com/

https://portal.msrc.microsoft.com/en-us/security-guidance/summary

Microsoft released its monthly security update Tuesday, disclosing 55 vulnerabilities across its suite of products. There are three critical vulnerabilities patched in this month and considered “more likely” to be exploited, according to Microsoft. This month’s security update provides patches for several major pieces of software, including Microsoft Office, SharePoint and Windows’ wireless networking