# CVE-2021-36942: Windows LSA Spoofing Vulnerability

> CVE-2021-36942: Windows LSA Spoofing Vulnerability. CVSS 7.5 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2021-36942
Last updated: 2026-08-10T15:10:06Z

- Published: 2021-08-12 18:12 UTC · Updated: 2026-08-10 15:10 UTC · Assigner: microsoft
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C
- EPSS: 66.0%, 99th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2021-11-17, ransomware use: Known

## Description

Windows LSA Spoofing Vulnerability

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Microsoft: Windows Server 2008 R2 Service Pack 1
- Microsoft: Windows Server 2008 R2 Service Pack 1 (Server Core installation)
- Microsoft: Windows Server 2008 Service Pack 2
- Microsoft: Windows Server 2008 Service Pack 2 (Server Core installation)
- Microsoft: Windows Server 2012
- Microsoft: Windows Server 2012 R2
- Microsoft: Windows Server 2012 R2 (Server Core installation)
- Microsoft: Windows Server 2012 (Server Core installation)
- Microsoft: Windows Server 2016
- Microsoft: Windows Server 2016 (Server Core installation)
- Microsoft: Windows Server 2019
- Microsoft: Windows Server 2019 (Server Core installation)
- Microsoft: Windows Server version 2004
- Microsoft: Windows Server version 20H2

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-36942)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2021-36942)
- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36942](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36942)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2021-36942 · Markdown: https://rewindex.com/cve/CVE-2021-36942.md · JSON: https://rewindex.com/api/v1/cves/CVE-2021-36942 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:13:44.752Z