Microsoft · Security update · December 14, 2021

KB5008215: December 2021 cumulative update for Windows 11 21H2

KB5008215, released December 14, 2021, fixes 31 CVEs across 2 products. One of them is being exploited (CVE-2021-43226); 1 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.

Patch now1 on CISA KEVKnown ransomware use5 publicly disclosedUnsupported product
CVEs closed
31
2 rated Critical
Exploited
1
CVE-2021-43226
Exploitation more likely
6
Vendor assessment
Highest EPSS
0.7097
99th percentile

Priority of the 31 CVEs

Patch now 1 Urgent 7 High 18 Routine 5

Applies to

ProductBuild after install
Windows 11 version 21H2 for ARM64-based Systems22000.376
Windows 11 version 21H2 for x64-based Systems22000.376

CVEs this fix closes

PriorityCVEComponentImpactCVSSEPSSExploitation
Patch now CVE-2021-43226 Windows Common Log File System Driver Elevation of Privilege 7.8 0.0328 KEVRansomwareExploited
Urgent CVE-2019-0887 Microsoft Windows Remote Code Execution 8.0 0.7097 More likely
Urgent CVE-2021-43883 Windows Installer Elevation of Privilege 7.8 0.1215 DisclosedMore likely
Urgent CVE-2021-43217 Windows Encrypting File System (EFS) Remote Code Execution 8.1 0.0652 Exploitation Less Likely
Urgent CVE-2021-43233 Remote Desktop Client Remote Code Execution 7.5 0.0236 More likely
Urgent CVE-2021-41333 Windows Print Spooler Components Elevation of Privilege 7.8 0.0108 DisclosedMore likely
Urgent CVE-2021-43207 Windows Common Log File System Driver Elevation of Privilege 7.8 0.0068 More likely
Urgent CVE-2021-43880 Windows Mobile Device Management Elevation of Privilege 5.5 0.0067 DisclosedMore likely
High CVE-2020-0655 Windows Shell Remote Code Execution 8.0 0.6569 Exploitation Less Likely
High CVE-2021-43893 Windows Encrypting File System (EFS) Elevation of Privilege 7.5 0.0672 DisclosedExploitation Less Likely
High CVE-2021-43228 Windows SymCrypt Denial of Service 7.5 0.0387 Exploitation Less Likely
High CVE-2021-43219 Windows DirectX Denial of Service 7.4 0.0387 Exploitation Less Likely
High CVE-2021-43222 Windows Message Queuing Information Disclosure 7.5 0.0317 Exploitation Less Likely
High CVE-2021-43236 Windows Message Queuing Information Disclosure 7.5 0.0317 Exploitation Less Likely
High CVE-2021-43232 Windows Event Tracing Remote Code Execution 7.8 0.0218 Exploitation Less Likely
High CVE-2021-43234 Role: Windows Fax Service Remote Code Execution 7.8 0.0218 Exploitation Less Likely
High CVE-2021-43229 Windows NTFS Elevation of Privilege 7.8 0.0179 Exploitation Less Likely
High CVE-2021-43237 Windows Update Stack Elevation of Privilege 7.8 0.0107 Exploitation Less Likely
High CVE-2021-43247 Windows TCP/IP Elevation of Privilege 7.8 0.0092 Exploitation Less Likely
High CVE-2021-43238 Windows Remote Access Connection Manager Elevation of Privilege 7.8 0.0091 Exploitation Less Likely
High CVE-2021-43231 Windows NTFS Elevation of Privilege 7.8 0.0072 Exploitation Less Likely
High CVE-2021-43230 Windows NTFS Elevation of Privilege 7.8 0.0057 Exploitation Less Likely
High CVE-2021-43240 Windows NTFS Elevation of Privilege 7.8 0.0057 DisclosedExploitation Less Likely
High CVE-2021-43239 Windows Update Stack Elevation of Privilege 7.1 0.0056 Exploitation Less Likely
High CVE-2021-43223 Windows Remote Access Connection Manager Elevation of Privilege 7.8 0.0054 Exploitation Less Likely
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