# KB5030211: September 2023 cumulative update for Windows 10 21H2

KB5030211, released September 12, 2023, fixes 16 CVEs across 6 products. One of them is being exploited (CVE-2023-36802); 1 on CISA KEV. Patch Radar priority: Patch now.

- Web page: https://patchblox.com/security/fix/microsoft/kb5030211
- Platform: Microsoft
- Released: Sep 12, 2023
- Priority: Patch now (Closes CVE-2023-36802, exploited (CISA KEV))
- CVEs: 16, exploited: 1, on CISA KEV: 1
- Vendor advisory: https://support.microsoft.com/help/5030211

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Windows 10 Version 21H2 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-21h2-for-32-bit-systems.md) |  |  |
| [Windows 10 Version 21H2 for ARM64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-21h2-for-arm64-based-systems.md) |  |  |
| [Windows 10 Version 21H2 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-21h2-for-x64-based-systems.md) |  |  |
| [Windows 10 Version 22H2 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-22h2-for-32-bit-systems.md) |  |  |
| [Windows 10 Version 22H2 for ARM64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-22h2-for-arm64-based-systems.md) |  |  |
| [Windows 10 Version 22H2 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/windows-10-version-22h2-for-x64-based-systems.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2023-36802](https://patchblox.com/security/data/cve/CVE-2023-36802.md) | Patch now | Microsoft Streaming Service | 7.8 | 0.2791 | CISA KEV |
| [CVE-2023-38148](https://patchblox.com/security/data/cve/CVE-2023-38148.md) | Urgent | Windows Internet Connection Sharing (ICS) | 8.8 | 0.0770 | More likely |
| [CVE-2023-38142](https://patchblox.com/security/data/cve/CVE-2023-38142.md) | Urgent | Windows Kernel | 7.8 | 0.0555 | More likely |
| [CVE-2023-38144](https://patchblox.com/security/data/cve/CVE-2023-38144.md) | Urgent | Windows Common Log File System Driver | 7.8 | 0.0345 | More likely |
| [CVE-2023-38143](https://patchblox.com/security/data/cve/CVE-2023-38143.md) | Urgent | Windows Common Log File System Driver | 7.8 | 0.0341 | More likely |
| [CVE-2023-38160](https://patchblox.com/security/data/cve/CVE-2023-38160.md) | Urgent | Windows TCP/IP | 5.5 | 0.0094 | More likely |
| [CVE-2023-36804](https://patchblox.com/security/data/cve/CVE-2023-36804.md) | Urgent | Windows GDI | 7.8 | 0.0060 | More likely |
| [CVE-2023-38161](https://patchblox.com/security/data/cve/CVE-2023-38161.md) | Urgent | Windows GDI | 7.8 | 0.0059 | More likely |
| [CVE-2023-38149](https://patchblox.com/security/data/cve/CVE-2023-38149.md) | High | Windows TCP/IP | 7.5 | 0.0448 |  |
| [CVE-2023-36805](https://patchblox.com/security/data/cve/CVE-2023-36805.md) | High | Windows Scripting | 7.0 | 0.0176 |  |
| [CVE-2023-38139](https://patchblox.com/security/data/cve/CVE-2023-38139.md) | High | Windows Kernel | 7.8 | 0.0093 |  |
| [CVE-2023-38147](https://patchblox.com/security/data/cve/CVE-2023-38147.md) | High | Microsoft Windows Codecs Library | 8.8 | 0.0089 |  |
| [CVE-2023-38141](https://patchblox.com/security/data/cve/CVE-2023-38141.md) | High | Windows Kernel | 7.8 | 0.0063 |  |
| [CVE-2023-35355](https://patchblox.com/security/data/cve/CVE-2023-35355.md) | High | Windows Cloud Files Mini Filter Driver | 7.8 | 0.0059 |  |
| [CVE-2023-38140](https://patchblox.com/security/data/cve/CVE-2023-38140.md) | Routine | Windows Kernel | 5.5 | 0.0106 |  |
| [CVE-2023-36803](https://patchblox.com/security/data/cve/CVE-2023-36803.md) | Routine | Windows Kernel | 5.5 | 0.0099 |  |

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Data as of 2026-11-07T12:40:37Z 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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