# KB5006669: October 2021 cumulative update for Windows 10 1607 KB5006669, released October 12, 2021, fixes 34 CVEs across 4 products. One of them is being exploited (CVE-2021-40449); 1 on CISA KEV. Patch Radar priority: Patch now. - Web page: https://patchblox.com/security/fix/microsoft/kb5006669 - Platform: Microsoft - Released: Oct 12, 2021 - Priority: Patch now (Closes CVE-2021-40449, exploited (CISA KEV, ransomware)) - CVEs: 34, exploited: 1, on CISA KEV: 1 - Vendor advisory: https://support.microsoft.com/help/5006669 ## Applies to | Product | Release | Fixed in | |---|---|---| | [Windows 10 Version 1607 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-1607-for-32-bit-systems.md) | | 14393.4704 | | [Windows 10 Version 1607 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-1607-for-x64-based-systems.md) | | 14393.4704 | | [Windows Server 2016](https://patchblox.com/security/data/product/microsoft/windows-server-2016.md) | | 14393.4704 | | [Windows Server 2016 (Server Core installation)](https://patchblox.com/security/data/product/microsoft/windows-server-2016-server-core-installation.md) | | 14393.4704 | ## CVEs this fix closes | CVE | Priority | Component | CVSS | EPSS | Exploitation | |---|---|---|---:|---:|---| | [CVE-2021-40449](https://patchblox.com/security/data/cve/CVE-2021-40449.md) | Patch now | Windows Win32K | 7.8 | 0.8194 | CISA KEV, Ransomware | | [CVE-2021-36970](https://patchblox.com/security/data/cve/CVE-2021-36970.md) | Urgent | Windows Print Spooler Components | 8.8 | 0.0306 | More likely | | [CVE-2021-40443](https://patchblox.com/security/data/cve/CVE-2021-40443.md) | Urgent | Windows Common Log File System Driver | 7.8 | 0.0065 | More likely | | [CVE-2021-40466](https://patchblox.com/security/data/cve/CVE-2021-40466.md) | Urgent | Windows Common Log File System Driver | 7.8 | 0.0065 | More likely | | [CVE-2021-40470](https://patchblox.com/security/data/cve/CVE-2021-40470.md) | Urgent | Windows DirectX | 7.8 | 0.0065 | More likely | | [CVE-2021-40467](https://patchblox.com/security/data/cve/CVE-2021-40467.md) | Urgent | Windows Common Log File System Driver | 7.8 | 0.0054 | More likely | | [CVE-2021-40469](https://patchblox.com/security/data/cve/CVE-2021-40469.md) | High | Role: DNS Server | 7.2 | 0.0758 | Disclosed | | [CVE-2021-36953](https://patchblox.com/security/data/cve/CVE-2021-36953.md) | High | Windows TCP/IP | 7.5 | 0.0505 | | | [CVE-2021-40463](https://patchblox.com/security/data/cve/CVE-2021-40463.md) | High | Windows Network Address Translation (NAT) | 7.7 | 0.0258 | | | [CVE-2021-40465](https://patchblox.com/security/data/cve/CVE-2021-40465.md) | High | Windows Text Shaping | 7.8 | 0.0247 | | | [CVE-2021-33781](https://patchblox.com/security/data/cve/CVE-2021-33781.md) | High | Windows Active Directory | 8.1 | 0.0241 | Disclosed | | [CVE-2021-40476](https://patchblox.com/security/data/cve/CVE-2021-40476.md) | High | Windows AppContainer | 7.5 | 0.0240 | | | [CVE-2021-41331](https://patchblox.com/security/data/cve/CVE-2021-41331.md) | High | Microsoft Windows Codecs Library | 7.8 | 0.0203 | | | [CVE-2021-41340](https://patchblox.com/security/data/cve/CVE-2021-41340.md) | High | Microsoft Graphics Component | 7.8 | 0.0203 | | | [CVE-2021-41335](https://patchblox.com/security/data/cve/CVE-2021-41335.md) | High | Windows Kernel | 7.8 | 0.0137 | Disclosed | | [CVE-2021-40488](https://patchblox.com/security/data/cve/CVE-2021-40488.md) | High | Windows Storage Spaces Controller | 7.8 | 0.0100 | | | [CVE-2021-26441](https://patchblox.com/security/data/cve/CVE-2021-26441.md) | High | Windows Storage Spaces Controller | 7.8 | 0.0094 | | | [CVE-2021-40478](https://patchblox.com/security/data/cve/CVE-2021-40478.md) | High | Windows Storage Spaces Controller | 7.8 | 0.0084 | | | [CVE-2021-40489](https://patchblox.com/security/data/cve/CVE-2021-40489.md) | High | Windows Storage Spaces Controller | 7.8 | 0.0084 | | | [CVE-2021-41345](https://patchblox.com/security/data/cve/CVE-2021-41345.md) | High | Windows Storage Spaces Controller | 7.8 | 0.0083 | | | [CVE-2021-26442](https://patchblox.com/security/data/cve/CVE-2021-26442.md) | High | Windows HTTP.sys | 7.0 | 0.0079 | | | [CVE-2021-41347](https://patchblox.com/security/data/cve/CVE-2021-41347.md) | High | Windows AppX Deployment Service | 7.8 | 0.0071 | | | [CVE-2021-40477](https://patchblox.com/security/data/cve/CVE-2021-40477.md) | High | Windows Event Tracing | 7.8 | 0.0058 | | | [CVE-2021-41338](https://patchblox.com/security/data/cve/CVE-2021-41338.md) | Routine | Windows AppContainer | 5.5 | 0.0330 | Disclosed | | [CVE-2021-41332](https://patchblox.com/security/data/cve/CVE-2021-41332.md) | Routine | Windows Print Spooler Components | 6.5 | 0.0272 | | | [CVE-2021-41337](https://patchblox.com/security/data/cve/CVE-2021-41337.md) | Routine | Role: Windows Active Directory Server | 4.9 | 0.0164 | | | [CVE-2021-41342](https://patchblox.com/security/data/cve/CVE-2021-41342.md) | Routine | Windows MSHTML Platform | 6.8 | 0.0163 | | | [CVE-2021-40460](https://patchblox.com/security/data/cve/CVE-2021-40460.md) | Routine | Windows Remote Procedure Call Runtime | 6.5 | 0.0161 | | | [CVE-2021-41361](https://patchblox.com/security/data/cve/CVE-2021-41361.md) | Routine | Active Directory Federation Services | 5.4 | 0.0095 | | | [CVE-2021-38662](https://patchblox.com/security/data/cve/CVE-2021-38662.md) | Routine | Windows Fast FAT Driver | 5.5 | 0.0078 | | | [CVE-2021-38663](https://patchblox.com/security/data/cve/CVE-2021-38663.md) | Routine | Windows exFAT File System | 5.5 | 0.0073 | | | [CVE-2021-41343](https://patchblox.com/security/data/cve/CVE-2021-41343.md) | Routine | Windows Fast FAT Driver | 5.5 | 0.0073 | | | [CVE-2021-40455](https://patchblox.com/security/data/cve/CVE-2021-40455.md) | Routine | Windows Installer | 5.5 | 0.0056 | | | [CVE-2021-40454](https://patchblox.com/security/data/cve/CVE-2021-40454.md) | Routine | Rich Text Edit Control | 5.5 | 0.0050 | | --- Data as of 2026-11-07T18:46:35Z UTC. 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