# 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. - Web page: https://patchblox.com/security/fix/microsoft/kb5008215 - Platform: Microsoft - Released: Dec 14, 2021 - Priority: Patch now (Closes CVE-2021-43226, exploited (CISA KEV, ransomware)) - CVEs: 31, exploited: 1, on CISA KEV: 1 - Vendor advisory: https://support.microsoft.com/help/5008215 ## Applies to | Product | Release | Fixed in | |---|---|---| | [Windows 11 version 21H2 for ARM64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-11-version-21h2-for-arm64-based-systems.md) | | 22000.376 | | [Windows 11 version 21H2 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-11-version-21h2-for-x64-based-systems.md) | | 22000.376 | ## CVEs this fix closes | CVE | Priority | Component | CVSS | EPSS | Exploitation | |---|---|---|---:|---:|---| | [CVE-2021-43226](https://patchblox.com/security/data/cve/CVE-2021-43226.md) | Patch now | Windows Common Log File System Driver | 7.8 | 0.0328 | CISA KEV, Ransomware | | [CVE-2019-0887](https://patchblox.com/security/data/cve/CVE-2019-0887.md) | Urgent | Microsoft Windows | 8.0 | 0.7097 | More likely | | [CVE-2021-43883](https://patchblox.com/security/data/cve/CVE-2021-43883.md) | Urgent | Windows Installer | 7.8 | 0.1215 | Disclosed | | [CVE-2021-43217](https://patchblox.com/security/data/cve/CVE-2021-43217.md) | Urgent | Windows Encrypting File System (EFS) | 8.1 | 0.0652 | | | [CVE-2021-43233](https://patchblox.com/security/data/cve/CVE-2021-43233.md) | Urgent | Remote Desktop Client | 7.5 | 0.0236 | More likely | | [CVE-2021-41333](https://patchblox.com/security/data/cve/CVE-2021-41333.md) | Urgent | Windows Print Spooler Components | 7.8 | 0.0108 | Disclosed | | [CVE-2021-43207](https://patchblox.com/security/data/cve/CVE-2021-43207.md) | Urgent | Windows Common Log File System Driver | 7.8 | 0.0068 | More likely | | [CVE-2021-43880](https://patchblox.com/security/data/cve/CVE-2021-43880.md) | Urgent | Windows Mobile Device Management | 5.5 | 0.0067 | Disclosed | | [CVE-2020-0655](https://patchblox.com/security/data/cve/CVE-2020-0655.md) | High | Windows Shell | 8.0 | 0.6569 | | | [CVE-2021-43893](https://patchblox.com/security/data/cve/CVE-2021-43893.md) | High | Windows Encrypting File System (EFS) | 7.5 | 0.0672 | Disclosed | | [CVE-2021-43228](https://patchblox.com/security/data/cve/CVE-2021-43228.md) | High | Windows SymCrypt | 7.5 | 0.0387 | | | [CVE-2021-43219](https://patchblox.com/security/data/cve/CVE-2021-43219.md) | High | Windows DirectX | 7.4 | 0.0387 | | | [CVE-2021-43222](https://patchblox.com/security/data/cve/CVE-2021-43222.md) | High | Windows Message Queuing | 7.5 | 0.0317 | | | [CVE-2021-43236](https://patchblox.com/security/data/cve/CVE-2021-43236.md) | High | Windows Message Queuing | 7.5 | 0.0317 | | | [CVE-2021-43232](https://patchblox.com/security/data/cve/CVE-2021-43232.md) | High | Windows Event Tracing | 7.8 | 0.0218 | | | [CVE-2021-43234](https://patchblox.com/security/data/cve/CVE-2021-43234.md) | High | Role: Windows Fax Service | 7.8 | 0.0218 | | | [CVE-2021-43229](https://patchblox.com/security/data/cve/CVE-2021-43229.md) | High | Windows NTFS | 7.8 | 0.0179 | | | [CVE-2021-43237](https://patchblox.com/security/data/cve/CVE-2021-43237.md) | High | Windows Update Stack | 7.8 | 0.0107 | | | [CVE-2021-43247](https://patchblox.com/security/data/cve/CVE-2021-43247.md) | High | Windows TCP/IP | 7.8 | 0.0092 | | | [CVE-2021-43238](https://patchblox.com/security/data/cve/CVE-2021-43238.md) | High | Windows Remote Access Connection Manager | 7.8 | 0.0091 | | | [CVE-2021-43231](https://patchblox.com/security/data/cve/CVE-2021-43231.md) | High | Windows NTFS | 7.8 | 0.0072 | | | [CVE-2021-43230](https://patchblox.com/security/data/cve/CVE-2021-43230.md) | High | Windows NTFS | 7.8 | 0.0057 | | | [CVE-2021-43240](https://patchblox.com/security/data/cve/CVE-2021-43240.md) | High | Windows NTFS | 7.8 | 0.0057 | Disclosed | | [CVE-2021-43239](https://patchblox.com/security/data/cve/CVE-2021-43239.md) | High | Windows Update Stack | 7.1 | 0.0056 | | | [CVE-2021-43223](https://patchblox.com/security/data/cve/CVE-2021-43223.md) | High | Windows Remote Access Connection Manager | 7.8 | 0.0054 | | | [CVE-2021-43248](https://patchblox.com/security/data/cve/CVE-2021-43248.md) | High | Microsoft Windows Codecs Library | 7.8 | 0.0054 | | | [CVE-2021-43224](https://patchblox.com/security/data/cve/CVE-2021-43224.md) | Routine | Windows Common Log File System Driver | 5.5 | 0.0393 | | | [CVE-2021-43216](https://patchblox.com/security/data/cve/CVE-2021-43216.md) | Routine | Microsoft Local Security Authority Server (lsasrv) | 6.5 | 0.0343 | | | [CVE-2021-43227](https://patchblox.com/security/data/cve/CVE-2021-43227.md) | Routine | Windows Storage Spaces Controller | 5.5 | 0.0079 | | | [CVE-2021-43235](https://patchblox.com/security/data/cve/CVE-2021-43235.md) | Routine | Windows Storage | 5.5 | 0.0079 | | | [CVE-2021-43246](https://patchblox.com/security/data/cve/CVE-2021-43246.md) | Routine | Role: Windows Hyper-V | 5.6 | 0.0077 | | --- Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.