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Sep 14, 2021
Update 2: Microsoft Zero-Day Vulnerability Announced - CVE-2021-40444
THE THREAT UPDATE 2: As of September 14th, Microsoft has released security patches to address CVE-2021-40444 for all impacted versions of Windows. eSentire has tested the update and confirmed its validity against public exploits. Organizations are strongly recommended to apply these security patches as soon as possible, as exploitation in the wild is ongoing. UPDATE: As of September 11th,…
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August 26, 2021 – Waterloo, ON -  eSentire, recognized globally as the Authority in Managed Detection and Response (MDR), announced today that it has been named a Leader in the IDC MarketScape: U.S. Managed Detection and Response Services 2021 Vendor Assessment (doc #US48129921, August 2021). IDC defines the core services an MDR must provide as follows: reduced time for onboarding, 24/7…
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Security advisories — May 11, 2021

Microsoft Patches Critical Vulnerabilities 

THE THREAT

On May 11th, 2021, Microsoft released scheduled security patches for fifty-five separate vulnerabilities impacting a variety of Microsoft products [1]. 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

Additional information

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.

References:

[1] https://msrc.microsoft.com/update-guide/vulnerability
[2] https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31166
[3] https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26419
[4] https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28476
[5] https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31194
[6] https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-31207