# CVE-2025-21407: Windows Telephony Service Remote Code Execution Vulnerability

CVE-2025-21407 is fixed in 37 products on 1 platform, first by KB5052006, released February 11, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-21407
- Priority: High
- CVSS: 8.8 (Important)
- EPSS: 0.0182
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Feb 11, 2025
- Weakness: Heap-based Buffer Overflow
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21407

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1607 for 32-bit Systems | 14393.7785 | [KB5052006](https://patchblox.com/security/data/fix/microsoft/kb5052006.md) | Feb 11, 2025 |
| Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.7785 | [KB5052006](https://patchblox.com/security/data/fix/microsoft/kb5052006.md) | Feb 11, 2025 |
| Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.6893 | [KB5052000](https://patchblox.com/security/data/fix/microsoft/kb5052000.md) | Feb 11, 2025 |
| Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.6893 | [KB5052000](https://patchblox.com/security/data/fix/microsoft/kb5052000.md) | Feb 11, 2025 |
| Microsoft | Windows 10 Version 21H2 for 32-bit Systems |  | [KB5051974](https://patchblox.com/security/data/fix/microsoft/kb5051974.md) | Feb 11, 2025 |
| Microsoft | Windows 10 Version 21H2 for ARM64-based Systems |  | [KB5051974](https://patchblox.com/security/data/fix/microsoft/kb5051974.md) | Feb 11, 2025 |
| Microsoft | Windows 10 Version 21H2 for x64-based Systems |  | [KB5051974](https://patchblox.com/security/data/fix/microsoft/kb5051974.md) | Feb 11, 2025 |
| Microsoft | Windows 10 Version 22H2 for 32-bit Systems |  | [KB5051974](https://patchblox.com/security/data/fix/microsoft/kb5051974.md) | Feb 11, 2025 |
| Microsoft | Windows 10 Version 22H2 for ARM64-based Systems |  | [KB5051974](https://patchblox.com/security/data/fix/microsoft/kb5051974.md) | Feb 11, 2025 |
| Microsoft | Windows 10 Version 22H2 for x64-based Systems |  | [KB5051974](https://patchblox.com/security/data/fix/microsoft/kb5051974.md) | Feb 11, 2025 |
| Microsoft | Windows 10 for 32-bit Systems | 10240.20915 | [KB5052040](https://patchblox.com/security/data/fix/microsoft/kb5052040.md) | Feb 11, 2025 |
| Microsoft | Windows 10 for x64-based Systems | 10240.20915 | [KB5052040](https://patchblox.com/security/data/fix/microsoft/kb5052040.md) | Feb 11, 2025 |
| Microsoft | Windows 11 Version 22H2 for ARM64-based Systems |  | [KB5051989](https://patchblox.com/security/data/fix/microsoft/kb5051989.md) | Feb 11, 2025 |
| Microsoft | Windows 11 Version 22H2 for x64-based Systems |  | [KB5051989](https://patchblox.com/security/data/fix/microsoft/kb5051989.md) | Feb 11, 2025 |
| Microsoft | Windows 11 Version 23H2 for ARM64-based Systems |  | [KB5051989](https://patchblox.com/security/data/fix/microsoft/kb5051989.md) | Feb 11, 2025 |
| Microsoft | Windows 11 Version 23H2 for x64-based Systems |  | [KB5051989](https://patchblox.com/security/data/fix/microsoft/kb5051989.md) | Feb 11, 2025 |
| Microsoft | Windows 11 Version 24H2 for ARM64-based Systems | 26100.3194 | [KB5051987](https://patchblox.com/security/data/fix/microsoft/kb5051987.md) | Feb 11, 2025 |
| Microsoft | Windows 11 Version 24H2 for ARM64-based Systems | 26100.3107 | [KB5052105](https://patchblox.com/security/data/fix/microsoft/kb5052105.md) | Feb 11, 2025 |
| Microsoft | Windows 11 Version 24H2 for x64-based Systems | 26100.3194 | [KB5051987](https://patchblox.com/security/data/fix/microsoft/kb5051987.md) | Feb 11, 2025 |
| Microsoft | Windows 11 Version 24H2 for x64-based Systems | 26100.3107 | [KB5052105](https://patchblox.com/security/data/fix/microsoft/kb5052105.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 |  | [KB5052032](https://patchblox.com/security/data/fix/microsoft/kb5052032.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 |  | [KB5052016](https://patchblox.com/security/data/fix/microsoft/kb5052016.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) |  | [KB5052032](https://patchblox.com/security/data/fix/microsoft/kb5052032.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) |  | [KB5052016](https://patchblox.com/security/data/fix/microsoft/kb5052016.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 |  | [KB5052072](https://patchblox.com/security/data/fix/microsoft/kb5052072.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 |  | [KB5052038](https://patchblox.com/security/data/fix/microsoft/kb5052038.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) |  | [KB5052072](https://patchblox.com/security/data/fix/microsoft/kb5052072.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) |  | [KB5052038](https://patchblox.com/security/data/fix/microsoft/kb5052038.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 |  | [KB5052072](https://patchblox.com/security/data/fix/microsoft/kb5052072.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 |  | [KB5052038](https://patchblox.com/security/data/fix/microsoft/kb5052038.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) |  | [KB5052072](https://patchblox.com/security/data/fix/microsoft/kb5052072.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) |  | [KB5052038](https://patchblox.com/security/data/fix/microsoft/kb5052038.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2012 |  | [KB5052020](https://patchblox.com/security/data/fix/microsoft/kb5052020.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2012 (Server Core installation) |  | [KB5052020](https://patchblox.com/security/data/fix/microsoft/kb5052020.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2012 R2 |  | [KB5052042](https://patchblox.com/security/data/fix/microsoft/kb5052042.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB5052042](https://patchblox.com/security/data/fix/microsoft/kb5052042.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2016 | 14393.7785 | [KB5052006](https://patchblox.com/security/data/fix/microsoft/kb5052006.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2016 (Server Core installation) | 14393.7785 | [KB5052006](https://patchblox.com/security/data/fix/microsoft/kb5052006.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2019 | 17763.6893 | [KB5052000](https://patchblox.com/security/data/fix/microsoft/kb5052000.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2019 (Server Core installation) | 17763.6893 | [KB5052000](https://patchblox.com/security/data/fix/microsoft/kb5052000.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2022 | 20348.3207 | [KB5051979](https://patchblox.com/security/data/fix/microsoft/kb5051979.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2022 | 20348.3148 | [KB5052106](https://patchblox.com/security/data/fix/microsoft/kb5052106.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2022 (Server Core installation) | 20348.3207 | [KB5051979](https://patchblox.com/security/data/fix/microsoft/kb5051979.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2022 (Server Core installation) | 20348.3148 | [KB5052106](https://patchblox.com/security/data/fix/microsoft/kb5052106.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 25398.1425 | [KB5051980](https://patchblox.com/security/data/fix/microsoft/kb5051980.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2025 | 26100.3194 | [KB5051987](https://patchblox.com/security/data/fix/microsoft/kb5051987.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2025 | 26100.3107 | [KB5052105](https://patchblox.com/security/data/fix/microsoft/kb5052105.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2025 (Server Core installation) | 26100.3194 | [KB5051987](https://patchblox.com/security/data/fix/microsoft/kb5051987.md) | Feb 11, 2025 |
| Microsoft | Windows Server 2025 (Server Core installation) | 26100.3107 | [KB5052105](https://patchblox.com/security/data/fix/microsoft/kb5052105.md) | Feb 11, 2025 |

---

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.