# KB5075971: February 2026 security update

KB5075971, released February 10, 2026, fixes 13 CVEs across 2 products. 4 of them are being exploited (CVE-2026-21510); 4 on CISA KEV. Patch Radar priority: Patch now.

- Web page: https://patchblox.com/security/fix/microsoft/kb5075971
- Platform: Microsoft
- Released: Feb 10, 2026
- Priority: Patch now (Closes CVE-2026-21510, exploited (CISA KEV))
- CVEs: 13, exploited: 4, on CISA KEV: 4
- Vendor advisory: https://support.microsoft.com/help/5075971

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Windows Server 2012](https://patchblox.com/security/data/product/microsoft/windows-server-2012.md) |  |  |
| [Windows Server 2012 (Server Core installation)](https://patchblox.com/security/data/product/microsoft/windows-server-2012-server-core-installation.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-21510](https://patchblox.com/security/data/cve/CVE-2026-21510.md) | Patch now | Windows Shell | 8.8 | 0.6124 | CISA KEV, Disclosed |
| [CVE-2026-21513](https://patchblox.com/security/data/cve/CVE-2026-21513.md) | Patch now | MSHTML Framework | 8.8 | 0.1585 | CISA KEV, Disclosed |
| [CVE-2026-21525](https://patchblox.com/security/data/cve/CVE-2026-21525.md) | Patch now | Windows Remote Access Connection Manager | 6.2 | 0.0504 | CISA KEV |
| [CVE-2026-21533](https://patchblox.com/security/data/cve/CVE-2026-21533.md) | Patch now | Windows Remote Desktop | 7.8 | 0.0434 | CISA KEV |
| [CVE-2026-21238](https://patchblox.com/security/data/cve/CVE-2026-21238.md) | Urgent | Windows Ancillary Function Driver for WinSock | 7.8 | 0.0333 | More likely |
| [CVE-2026-21231](https://patchblox.com/security/data/cve/CVE-2026-21231.md) | Urgent | Windows Kernel | 7.8 | 0.0252 | More likely |
| [CVE-2026-21253](https://patchblox.com/security/data/cve/CVE-2026-21253.md) | Urgent | Mailslot File System | 7.0 | 0.0079 | More likely |
| [CVE-2026-20846](https://patchblox.com/security/data/cve/CVE-2026-20846.md) | High | Windows GDI+ | 7.5 | 0.0141 |  |
| [CVE-2026-21235](https://patchblox.com/security/data/cve/CVE-2026-21235.md) | High | Microsoft Graphics Component | 7.3 | 0.0073 |  |
| [CVE-2026-21508](https://patchblox.com/security/data/cve/CVE-2026-21508.md) | High | Windows Storage | 7.0 | 0.0044 |  |
| [CVE-2026-21236](https://patchblox.com/security/data/cve/CVE-2026-21236.md) | High | Windows Ancillary Function Driver for WinSock | 7.8 | 0.0044 |  |
| [CVE-2026-21239](https://patchblox.com/security/data/cve/CVE-2026-21239.md) | High | Windows Kernel | 7.8 | 0.0044 |  |
| [CVE-2026-21246](https://patchblox.com/security/data/cve/CVE-2026-21246.md) | High | Microsoft Graphics Component | 7.8 | 0.0044 |  |

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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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