# CVE-2025-21174: Windows Standards-Based Storage Management Service Denial of Service Vulnerability

CVE-2025-21174 is fixed in 10 products on 1 platform, first by KB5055521, released April 8, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-21174
- Priority: High
- CVSS: 7.5 (Important)
- EPSS: 0.0218
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Apr 11, 2025
- Weakness: Uncontrolled Resource Consumption
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21174

## Description

<p>Uncontrolled resource consumption in Windows Standards-Based Storage Management Service allows an unauthorized attacker to deny service over a network.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows Server 2012 R2 |  | [KB5056456](https://patchblox.com/security/data/fix/microsoft/kb5056456.md) | Apr 11, 2025 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) |  | [KB5056456](https://patchblox.com/security/data/fix/microsoft/kb5056456.md) | Apr 11, 2025 |
| Microsoft | Windows Server 2016 | 14393.7969 | [KB5055521](https://patchblox.com/security/data/fix/microsoft/kb5055521.md) | Apr 8, 2025 |
| Microsoft | Windows Server 2016 (Server Core installation) | 14393.7969 | [KB5055521](https://patchblox.com/security/data/fix/microsoft/kb5055521.md) | Apr 8, 2025 |
| Microsoft | Windows Server 2019 | 17763.7136 | [KB5055519](https://patchblox.com/security/data/fix/microsoft/kb5055519.md) | Apr 8, 2025 |
| Microsoft | Windows Server 2019 (Server Core installation) | 17763.7136 | [KB5055519](https://patchblox.com/security/data/fix/microsoft/kb5055519.md) | Apr 8, 2025 |
| Microsoft | Windows Server 2022 | 20348.3453 | [KB5055526](https://patchblox.com/security/data/fix/microsoft/kb5055526.md) | Apr 8, 2025 |
| Microsoft | Windows Server 2022 (Server Core installation) | 20348.3453 | [KB5055526](https://patchblox.com/security/data/fix/microsoft/kb5055526.md) | Apr 8, 2025 |
| Microsoft | Windows Server 2025 | 26100.3775 | [KB5055523](https://patchblox.com/security/data/fix/microsoft/kb5055523.md) | Apr 8, 2025 |
| Microsoft | Windows Server 2025 (Server Core installation) | 26100.3775 | [KB5055523](https://patchblox.com/security/data/fix/microsoft/kb5055523.md) | Apr 8, 2025 |

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Data as of 2026-11-08T06:59:42Z 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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