# CVE-2025-27475: Windows Update Stack Elevation of Privilege Vulnerability

CVE-2025-27475 is fixed in 6 products on 1 platform, first by KB5055528, released April 8, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-27475
- Priority: High
- CVSS: 7.0 (Important)
- EPSS: 0.0037
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Apr 8, 2025
- Weakness: Sensitive Data Storage in Improperly Locked Memory
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-27475

## Description

<p>Sensitive data storage in improperly locked memory in Windows Update Stack allows an authorized attacker to elevate privileges locally.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 11 Version 22H2 for ARM64-based Systems |  | [KB5055528](https://patchblox.com/security/data/fix/microsoft/kb5055528.md) | Apr 8, 2025 |
| Microsoft | Windows 11 Version 22H2 for x64-based Systems |  | [KB5055528](https://patchblox.com/security/data/fix/microsoft/kb5055528.md) | Apr 8, 2025 |
| Microsoft | Windows 11 Version 23H2 for ARM64-based Systems |  | [KB5055528](https://patchblox.com/security/data/fix/microsoft/kb5055528.md) | Apr 8, 2025 |
| Microsoft | Windows 11 Version 23H2 for x64-based Systems |  | [KB5055528](https://patchblox.com/security/data/fix/microsoft/kb5055528.md) | Apr 8, 2025 |
| Microsoft | Windows 11 Version 24H2 for ARM64-based Systems | 26100.3775 | [KB5055523](https://patchblox.com/security/data/fix/microsoft/kb5055523.md) | Apr 8, 2025 |
| Microsoft | Windows 11 Version 24H2 for x64-based Systems | 26100.3775 | [KB5055523](https://patchblox.com/security/data/fix/microsoft/kb5055523.md) | Apr 8, 2025 |

---

Data as of 2026-11-08T13:06:02Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo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.