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On May 11th, 2021, Microsoft released scheduled security patches for fifty-five separate vulnerabilities impacting a variety of Microsoft products . Four vulnerabilities (CVE-2021-31166, CVE-2021-26419, CVE-2021-28476, CVE-2021-31194) are tracked as critical and should be immediate priority for patching. Additionally, Microsoft announced a high impact vulnerability (CVE-2021-31207) affecting on premises Microsoft Exchange servers that may allow threat actors to bypass Microsoft security features.
At this time, there is no indication that any of the vulnerabilities from this month’s release have been exploited in attacks in the wild. Organizations are strongly recommended to review Microsoft’s Patch Tuesday release and apply the available security patches.
What we’re doing about it
What you should do about it
CVE-2021-31166 (CVSS: 9.8): HTTP Protocol Stack Remote Code Execution Vulnerability
CVE-2021-26419 (CVSS: 7.5): Scripting Engine Memory Corruption Vulnerability
CVE-2021-28476 (CVSS: 9.9): Hyper-V Remote Code Execution Vulnerability
CVE-2021-31194 (CVSS: 8.8): OLE Automation Remote Code Execution Vulnerability
CVE-2021-31207 (CVSS: 6.6): Microsoft Exchange Server Security Feature Bypass Vulnerability
For additional details and information on the rest of the vulnerabilities covered in the May Patch Tuesday release, please see the full release from Microsoft.