# KB5075970: February 2026 security update

KB5075970, released February 10, 2026, fixes 15 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/kb5075970
- Platform: Microsoft
- Released: Feb 10, 2026
- Priority: Patch now (Closes CVE-2026-21510, exploited (CISA KEV))
- CVEs: 15, exploited: 4, on CISA KEV: 4
- Vendor advisory: https://support.microsoft.com/help/5075970

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Windows Server 2012 R2](https://patchblox.com/security/data/product/microsoft/windows-server-2012-r2.md) |  |  |
| [Windows Server 2012 R2 (Server Core installation)](https://patchblox.com/security/data/product/microsoft/windows-server-2012-r2-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 |  |
| [CVE-2026-21249](https://patchblox.com/security/data/cve/CVE-2026-21249.md) | Routine | Windows NTLM | 3.3 | 0.1128 |  |
| [CVE-2026-21222](https://patchblox.com/security/data/cve/CVE-2026-21222.md) | Routine | Windows Kernel | 5.5 | 0.0060 |  |

---

Data as of 2026-11-08T19:12:23Z 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

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.