# KB5000841: March 2021 security update KB5000841, released March 9, 2021, fixes 23 CVEs across 7 products. One of them is being exploited (CVE-2021-26411); 1 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported. - Web page: https://patchblox.com/security/fix/microsoft/kb5000841 - Platform: Microsoft - Released: Mar 9, 2021 - Priority: Patch now (Closes CVE-2021-26411, exploited (CISA KEV, ransomware)) - CVEs: 23, exploited: 1, on CISA KEV: 1 - Vendor advisory: https://support.microsoft.com/help/5000841 ## Applies to | Product | Release | Fixed in | |---|---|---| | [Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1](https://patchblox.com/security/data/product/microsoft/internet-explorer-11-on-windows-7-for-32-bit-systems-service-pack-1.md) | | | | [Internet Explorer 11 on Windows 7 for x64-based Systems Service Pack 1](https://patchblox.com/security/data/product/microsoft/internet-explorer-11-on-windows-7-for-x64-based-systems-service-pack-1.md) | | | | [Internet Explorer 11 on Windows Server 2008 R2 for x64-based Systems Service Pack 1](https://patchblox.com/security/data/product/microsoft/internet-explorer-11-on-windows-server-2008-r2-for-x64-based-systems-service-pack-1.md) | | | | [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-2021-26411](https://patchblox.com/security/data/cve/CVE-2021-26411.md) | Patch now | Internet Explorer | 8.8 | 0.8167 | CISA KEV, Ransomware, Disclosed | | [CVE-2021-26877](https://patchblox.com/security/data/cve/CVE-2021-26877.md) | Urgent | Role: DNS Server | 9.8 | 0.1729 | More likely | | [CVE-2021-26897](https://patchblox.com/security/data/cve/CVE-2021-26897.md) | Urgent | Role: DNS Server | 9.8 | 0.1164 | More likely | | [CVE-2021-26896](https://patchblox.com/security/data/cve/CVE-2021-26896.md) | High | Role: DNS Server | 7.5 | 0.0785 | | | [CVE-2021-26894](https://patchblox.com/security/data/cve/CVE-2021-26894.md) | High | Role: DNS Server | 9.8 | 0.0776 | | | [CVE-2021-26895](https://patchblox.com/security/data/cve/CVE-2021-26895.md) | High | Role: DNS Server | 9.8 | 0.0776 | | | [CVE-2021-26893](https://patchblox.com/security/data/cve/CVE-2021-26893.md) | High | Role: DNS Server | 9.8 | 0.0702 | | | [CVE-2021-27063](https://patchblox.com/security/data/cve/CVE-2021-27063.md) | High | Role: DNS Server | 7.5 | 0.0673 | | | [CVE-2021-26861](https://patchblox.com/security/data/cve/CVE-2021-26861.md) | High | Microsoft Graphics Component | 7.8 | 0.0289 | | | [CVE-2021-26881](https://patchblox.com/security/data/cve/CVE-2021-26881.md) | High | Windows Media | 7.5 | 0.0283 | | | [CVE-2021-26882](https://patchblox.com/security/data/cve/CVE-2021-26882.md) | High | Windows Remote Access API | 7.8 | 0.0211 | | | [CVE-2021-27077](https://patchblox.com/security/data/cve/CVE-2021-27077.md) | High | Microsoft Graphics Component | 7.8 | 0.0144 | Disclosed | | [CVE-2021-26862](https://patchblox.com/security/data/cve/CVE-2021-26862.md) | High | Windows Installer | 7.0 | 0.0125 | | | [CVE-2021-26873](https://patchblox.com/security/data/cve/CVE-2021-26873.md) | High | Windows User Profile Service | 7.0 | 0.0115 | | | [CVE-2021-26899](https://patchblox.com/security/data/cve/CVE-2021-26899.md) | High | Windows UPnP Device Host | 7.8 | 0.0097 | | | [CVE-2021-1640](https://patchblox.com/security/data/cve/CVE-2021-1640.md) | High | Windows Print Spooler Components | 7.8 | 0.0095 | | | [CVE-2021-26898](https://patchblox.com/security/data/cve/CVE-2021-26898.md) | High | Windows Event Tracing | 7.8 | 0.0087 | | | [CVE-2021-26875](https://patchblox.com/security/data/cve/CVE-2021-26875.md) | High | Microsoft Graphics Component | 7.8 | 0.0087 | | | [CVE-2021-26878](https://patchblox.com/security/data/cve/CVE-2021-26878.md) | High | Windows Print Spooler Components | 7.8 | 0.0085 | | | [CVE-2021-26901](https://patchblox.com/security/data/cve/CVE-2021-26901.md) | High | Windows Event Tracing | 7.8 | 0.0082 | | | [CVE-2021-26872](https://patchblox.com/security/data/cve/CVE-2021-26872.md) | High | Windows Event Tracing | 7.8 | 0.0075 | | | [CVE-2021-24107](https://patchblox.com/security/data/cve/CVE-2021-24107.md) | Routine | Windows Event Tracing | 5.5 | 0.0103 | | | [CVE-2021-26869](https://patchblox.com/security/data/cve/CVE-2021-26869.md) | Routine | Microsoft ActiveX | 5.5 | 0.0103 | | --- Data as of 2026-11-07T06:34:28Z 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