# KB5005633: September 2021 security update KB5005633, released September 14, 2021, fixes 25 CVEs across 4 products. 2 of them are being exploited (CVE-2021-40444); 2 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported. - Web page: https://patchblox.com/security/fix/microsoft/kb5005633 - Platform: Microsoft - Released: Sep 14, 2021 - Priority: Patch now (Closes CVE-2021-40444, exploited (CISA KEV, ransomware)) - CVEs: 25, exploited: 2, on CISA KEV: 2 - Vendor advisory: https://support.microsoft.com/help/5005633 ## Applies to | Product | Release | Fixed in | |---|---|---| | [Windows 7 for 32-bit Systems Service Pack 1](https://patchblox.com/security/data/product/microsoft/windows-7-for-32-bit-systems-service-pack-1.md) | | | | [Windows 7 for x64-based Systems Service Pack 1](https://patchblox.com/security/data/product/microsoft/windows-7-for-x64-based-systems-service-pack-1.md) | | | | [Windows Server 2008 R2 for x64-based Systems Service Pack 1](https://patchblox.com/security/data/product/microsoft/windows-server-2008-r2-for-x64-based-systems-service-pack-1.md) | | | | [Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)](https://patchblox.com/security/data/product/microsoft/windows-server-2008-r2-for-x64-based-systems-service-pack-1-server-core-installation.md) | | | ## CVEs this fix closes | CVE | Priority | Component | CVSS | EPSS | Exploitation | |---|---|---|---:|---:|---| | [CVE-2021-40444](https://patchblox.com/security/data/cve/CVE-2021-40444.md) | Patch now | Windows MSHTML Platform | 8.8 | 0.9784 | CISA KEV, Ransomware, Disclosed | | [CVE-2021-36955](https://patchblox.com/security/data/cve/CVE-2021-36955.md) | Patch now | Windows Common Log File System Driver | 7.8 | 0.0407 | CISA KEV, Ransomware | | [CVE-2021-36958](https://patchblox.com/security/data/cve/CVE-2021-36958.md) | Urgent | Windows Print Spooler Components | 7.8 | 0.3079 | Disclosed | | [CVE-2021-26435](https://patchblox.com/security/data/cve/CVE-2021-26435.md) | Urgent | Windows Scripting | 8.1 | 0.0538 | | | [CVE-2021-36965](https://patchblox.com/security/data/cve/CVE-2021-36965.md) | Urgent | Windows WLAN Auto Config Service | 8.8 | 0.0468 | | | [CVE-2021-38639](https://patchblox.com/security/data/cve/CVE-2021-38639.md) | Urgent | Windows Win32K | 7.8 | 0.0136 | More likely | | [CVE-2021-36963](https://patchblox.com/security/data/cve/CVE-2021-36963.md) | Urgent | Windows Common Log File System Driver | 7.8 | 0.0122 | More likely | | [CVE-2021-38633](https://patchblox.com/security/data/cve/CVE-2021-38633.md) | Urgent | Windows Common Log File System Driver | 7.8 | 0.0103 | More likely | | [CVE-2021-38671](https://patchblox.com/security/data/cve/CVE-2021-38671.md) | Urgent | Windows Print Spooler Components | 7.8 | 0.0055 | More likely | | [CVE-2021-1678](https://patchblox.com/security/data/cve/CVE-2021-1678.md) | High | Windows NTLM | 8.8 | 0.1003 | | | [CVE-2021-36960](https://patchblox.com/security/data/cve/CVE-2021-36960.md) | High | Windows SMB | 7.5 | 0.0329 | | | [CVE-2021-40447](https://patchblox.com/security/data/cve/CVE-2021-40447.md) | High | Windows Print Spooler Components | 7.8 | 0.0071 | | | [CVE-2021-38667](https://patchblox.com/security/data/cve/CVE-2021-38667.md) | High | Windows Print Spooler Components | 7.8 | 0.0055 | | | [CVE-2021-36968](https://patchblox.com/security/data/cve/CVE-2021-36968.md) | High | Microsoft Windows DNS | 7.8 | 0.0055 | Disclosed | | [CVE-2021-36964](https://patchblox.com/security/data/cve/CVE-2021-36964.md) | High | Windows Event Tracing | 7.8 | 0.0053 | | | [CVE-2021-38628](https://patchblox.com/security/data/cve/CVE-2021-38628.md) | High | Windows Ancillary Function Driver for WinSock | 7.8 | 0.0053 | | | [CVE-2021-38630](https://patchblox.com/security/data/cve/CVE-2021-38630.md) | High | Windows Event Tracing | 7.8 | 0.0053 | | | [CVE-2021-38638](https://patchblox.com/security/data/cve/CVE-2021-38638.md) | High | Windows Ancillary Function Driver for WinSock | 7.8 | 0.0052 | | | [CVE-2021-38629](https://patchblox.com/security/data/cve/CVE-2021-38629.md) | Routine | Windows TDX.sys | 6.5 | 0.0269 | | | [CVE-2021-36959](https://patchblox.com/security/data/cve/CVE-2021-36959.md) | Routine | Windows Authenticode | 5.5 | 0.0135 | | | [CVE-2021-36962](https://patchblox.com/security/data/cve/CVE-2021-36962.md) | Routine | Windows Installer | 5.5 | 0.0129 | | | [CVE-2021-36961](https://patchblox.com/security/data/cve/CVE-2021-36961.md) | Routine | Windows Installer | 5.5 | 0.0106 | | | [CVE-2021-36969](https://patchblox.com/security/data/cve/CVE-2021-36969.md) | Routine | Windows Redirected Drive Buffering | 5.5 | 0.0088 | | | [CVE-2021-38635](https://patchblox.com/security/data/cve/CVE-2021-38635.md) | Routine | Windows Redirected Drive Buffering | 5.5 | 0.0088 | | | [CVE-2021-38636](https://patchblox.com/security/data/cve/CVE-2021-38636.md) | Routine | Windows Redirected Drive Buffering | 5.5 | 0.0088 | | --- Data as of 2026-11-07T18:46:35Z UTC. 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