# CVE-2021-43883: Windows Installer Elevation of Privilege Vulnerability

CVE-2021-43883 is fixed in 46 products on 1 platform, first by KB5008207, released December 14, 2021. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2021-43883
- Priority: Urgent
- CVSS: 7.8 (Important)
- EPSS: 0.1215
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: yes
- Vendor exploitability assessment: Exploitation More Likely
- Published: Dec 14, 2021
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-43883

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1607 for 32-bit Systems | 14393.4825 | [KB5008207](https://patchblox.com/security/data/fix/microsoft/kb5008207.md) | Dec 14, 2021 |
| Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.4825 | [KB5008207](https://patchblox.com/security/data/fix/microsoft/kb5008207.md) | Dec 14, 2021 |
| Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.2366 | [KB5008218](https://patchblox.com/security/data/fix/microsoft/kb5008218.md) | Dec 14, 2021 |
| Microsoft | Windows 10 Version 1809 for ARM64-based Systems | 17763.2366 | [KB5008218](https://patchblox.com/security/data/fix/microsoft/kb5008218.md) | Dec 14, 2021 |
| Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.2366 | [KB5008218](https://patchblox.com/security/data/fix/microsoft/kb5008218.md) | Dec 14, 2021 |
| Microsoft | Windows 10 Version 1909 for 32-bit Systems | 18363.1977 | [KB5008206](https://patchblox.com/security/data/fix/microsoft/kb5008206.md) | Dec 14, 2021 |
| Microsoft | Windows 10 Version 1909 for ARM64-based Systems | 18363.1977 | [KB5008206](https://patchblox.com/security/data/fix/microsoft/kb5008206.md) | Dec 14, 2021 |
| Microsoft | Windows 10 Version 1909 for x64-based Systems | 18363.1977 | [KB5008206](https://patchblox.com/security/data/fix/microsoft/kb5008206.md) | Dec 14, 2021 |
| Microsoft | Windows 10 Version 2004 for 32-bit Systems |  | [KB5008212](https://patchblox.com/security/data/fix/microsoft/kb5008212.md) | Dec 14, 2021 |
| Microsoft | Windows 10 Version 2004 for ARM64-based Systems |  | [KB5008212](https://patchblox.com/security/data/fix/microsoft/kb5008212.md) | Dec 14, 2021 |
| Microsoft | Windows 10 Version 2004 for x64-based Systems |  | [KB5008212](https://patchblox.com/security/data/fix/microsoft/kb5008212.md) | Dec 14, 2021 |
| Microsoft | Windows 10 Version 20H2 for 32-bit Systems |  | [KB5008212](https://patchblox.com/security/data/fix/microsoft/kb5008212.md) | Dec 14, 2021 |
| Microsoft | Windows 10 Version 20H2 for ARM64-based Systems |  | [KB5008212](https://patchblox.com/security/data/fix/microsoft/kb5008212.md) | Dec 14, 2021 |
| Microsoft | Windows 10 Version 21H1 for 32-bit Systems |  | [KB5008212](https://patchblox.com/security/data/fix/microsoft/kb5008212.md) | Dec 14, 2021 |
| Microsoft | Windows 10 Version 21H1 for ARM64-based Systems |  | [KB5008212](https://patchblox.com/security/data/fix/microsoft/kb5008212.md) | Dec 14, 2021 |
| Microsoft | Windows 10 Version 21H1 for x64-based Systems |  | [KB5008212](https://patchblox.com/security/data/fix/microsoft/kb5008212.md) | Dec 14, 2021 |
| Microsoft | Windows 10 Version 21H2 for 32-bit Systems |  | [KB5008212](https://patchblox.com/security/data/fix/microsoft/kb5008212.md) | Dec 14, 2021 |
| Microsoft | Windows 10 Version 21H2 for ARM64-based Systems |  | [KB5008212](https://patchblox.com/security/data/fix/microsoft/kb5008212.md) | Dec 14, 2021 |
| Microsoft | Windows 10 Version 21H2 for x64-based Systems |  | [KB5008212](https://patchblox.com/security/data/fix/microsoft/kb5008212.md) | Dec 14, 2021 |
| Microsoft | Windows 10 for 32-bit Systems | 10240.19145 | [KB5008230](https://patchblox.com/security/data/fix/microsoft/kb5008230.md) | Dec 14, 2021 |
| Microsoft | Windows 10 for x64-based Systems | 10240.19145 | [KB5008230](https://patchblox.com/security/data/fix/microsoft/kb5008230.md) | Dec 14, 2021 |
| Microsoft | Windows 11 version 21H2 for ARM64-based Systems | 22000.376 | [KB5008215](https://patchblox.com/security/data/fix/microsoft/kb5008215.md) | Dec 14, 2021 |
| Microsoft | Windows 11 version 21H2 for x64-based Systems | 22000.376 | [KB5008215](https://patchblox.com/security/data/fix/microsoft/kb5008215.md) | Dec 14, 2021 |
| Microsoft | Windows 7 for 32-bit Systems Service Pack 1 |  | [KB5008282](https://patchblox.com/security/data/fix/microsoft/kb5008282.md) | Dec 14, 2021 |
| Microsoft | Windows 7 for 32-bit Systems Service Pack 1 |  | [KB5008244](https://patchblox.com/security/data/fix/microsoft/kb5008244.md) | Dec 14, 2021 |
| Microsoft | Windows 7 for x64-based Systems Service Pack 1 |  | [KB5008282](https://patchblox.com/security/data/fix/microsoft/kb5008282.md) | Dec 14, 2021 |
| Microsoft | Windows 7 for x64-based Systems Service Pack 1 |  | [KB5008244](https://patchblox.com/security/data/fix/microsoft/kb5008244.md) | Dec 14, 2021 |
| Microsoft | Windows 8.1 for 32-bit systems |  | [KB5008285](https://patchblox.com/security/data/fix/microsoft/kb5008285.md) | Dec 14, 2021 |
| Microsoft | Windows 8.1 for 32-bit systems |  | [KB5008263](https://patchblox.com/security/data/fix/microsoft/kb5008263.md) | Dec 14, 2021 |
| Microsoft | Windows 8.1 for x64-based systems |  | [KB5008285](https://patchblox.com/security/data/fix/microsoft/kb5008285.md) | Dec 14, 2021 |
| Microsoft | Windows 8.1 for x64-based systems |  | [KB5008263](https://patchblox.com/security/data/fix/microsoft/kb5008263.md) | Dec 14, 2021 |
| Microsoft | Windows RT 8.1 |  | [KB5008263](https://patchblox.com/security/data/fix/microsoft/kb5008263.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 |  | [KB5008282](https://patchblox.com/security/data/fix/microsoft/kb5008282.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 |  | [KB5008244](https://patchblox.com/security/data/fix/microsoft/kb5008244.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) |  | [KB5008282](https://patchblox.com/security/data/fix/microsoft/kb5008282.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) |  | [KB5008244](https://patchblox.com/security/data/fix/microsoft/kb5008244.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 |  | [KB5008274](https://patchblox.com/security/data/fix/microsoft/kb5008274.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 |  | [KB5008271](https://patchblox.com/security/data/fix/microsoft/kb5008271.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) |  | [KB5008274](https://patchblox.com/security/data/fix/microsoft/kb5008274.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) |  | [KB5008271](https://patchblox.com/security/data/fix/microsoft/kb5008271.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 |  | [KB5008274](https://patchblox.com/security/data/fix/microsoft/kb5008274.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 |  | [KB5008271](https://patchblox.com/security/data/fix/microsoft/kb5008271.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) |  | [KB5008274](https://patchblox.com/security/data/fix/microsoft/kb5008274.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) |  | [KB5008271](https://patchblox.com/security/data/fix/microsoft/kb5008271.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2012 |  | [KB5008255](https://patchblox.com/security/data/fix/microsoft/kb5008255.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2012 |  | [KB5008277](https://patchblox.com/security/data/fix/microsoft/kb5008277.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2012 (Server Core installation) |  | [KB5008255](https://patchblox.com/security/data/fix/microsoft/kb5008255.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2012 (Server Core installation) |  | [KB5008277](https://patchblox.com/security/data/fix/microsoft/kb5008277.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2012 R2 |  | [KB5008285](https://patchblox.com/security/data/fix/microsoft/kb5008285.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2012 R2 |  | [KB5008263](https://patchblox.com/security/data/fix/microsoft/kb5008263.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB5008285](https://patchblox.com/security/data/fix/microsoft/kb5008285.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB5008263](https://patchblox.com/security/data/fix/microsoft/kb5008263.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2016 | 14393.4825 | [KB5008207](https://patchblox.com/security/data/fix/microsoft/kb5008207.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2016 (Server Core installation) | 14393.4825 | [KB5008207](https://patchblox.com/security/data/fix/microsoft/kb5008207.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2019 | 17763.2366 | [KB5008218](https://patchblox.com/security/data/fix/microsoft/kb5008218.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2019 (Server Core installation) | 17763.2366 | [KB5008218](https://patchblox.com/security/data/fix/microsoft/kb5008218.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2022 | 20348.405 | [KB5008223](https://patchblox.com/security/data/fix/microsoft/kb5008223.md) | Dec 14, 2021 |
| Microsoft | Windows Server 2022 (Server Core installation) | 20348.405 | [KB5008223](https://patchblox.com/security/data/fix/microsoft/kb5008223.md) | Dec 14, 2021 |
| Microsoft | Windows Server, version 2004 (Server Core installation) |  | [KB5008212](https://patchblox.com/security/data/fix/microsoft/kb5008212.md) | Dec 14, 2021 |
| Microsoft | Windows Server, version 20H2 (Server Core Installation) |  | [KB5008212](https://patchblox.com/security/data/fix/microsoft/kb5008212.md) | Dec 14, 2021 |

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Data as of 2026-11-07T18:46:35Z 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

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