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Microsoft June 2021 Security Updates


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The Microsoft June 2021 security updates have been released and consist of 50 CVEs.  Of these 50 CVEs, 5 are rated Critical and 45 are rated Important in severity.  


According to Microsoft, six of these bugs are currently under active attach and three are publicly known at the time of release.



You must install the May 11, 2021 update (KB5003173) before installing the latest cumulative update (LCU).

Microsoft now combines the latest servicing stack update (SSU) for your operating system with the latest LCU. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

Recommended Reading:   See Dustin Childs review and analysis in Zero Day Initiative -- The June 2021 Security Update Review.

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