May 2021 Monthly Patch Release

Published on 12 May 2021

Updated on 12 May 2021

Microsoft has released security patches to address multiple vulnerabilities in their software and products.

The vulnerabilities that have been classified as Critical in severity are listed in the table below.

For the full list of security patches released by Microsoft, please refer to https://portal.msrc.microsoft.com/en-us/security-guidance/releasenotedetail/2021-May

CRITICAL VULNERABILITIES
CVE NumberCVE NameBase ScoreReference
CVE-2021-28476Hyper-V Remote Code Execution Vulnerability9.9https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28476
CVE-2021-31166HTTP Protocol Stack Remote Code Execution Vulnerability9.8https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31166
CVE-2021-31194OLE Automation Remote Code Execution Vulnerability8.8https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31194
CVE-2021-26419Scripting Engine Memory Corruption Vulnerability6.4https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26419