# CVE-2021-36942

Windows LSA Spoofing Vulnerability

- Page: https://www.vulneraibility.com/cve/CVE-2021-36942
- CVSS: 7.5
- Known exploited: yes, in CISA KEV since 2021-11-03; CISA due date 2021-11-17; known ransomware use
- EPSS: 66.02% (percentile 99.3)
- Detection templates only, no public exploit found: 1 Metasploit module
- CISA SSVC: exploitation active, automatable yes, technical impact total (assessed 2025-02-04)
- Published: 2021-08-12

## Affected versions

- Microsoft Windows Server 2008 R2 Service Pack 1: affected >= 6.1.7601.0 and < 6.1.7601.25685
- Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation): affected >= 6.1.7601.0 and < 6.1.7601.25685
- Microsoft Windows Server 2008 Service Pack 2: affected >= 6.0.6003.0 and < 6.0.6003.21192
- Microsoft Windows Server 2008 Service Pack 2 (Server Core installation): affected >= 6.0.6003.0 and < 6.0.6003.21192
- Microsoft Windows Server 2012: affected >= 6.2.9200.0 and < 6.2.9200.23435
- Microsoft Windows Server 2012 R2: affected >= 6.3.9600.0 and < 6.3.9600.20094
- Microsoft Windows Server 2012 R2 (Server Core installation): affected >= 6.3.9600.0 and < 6.3.9600.20094
- Microsoft Windows Server 2012 (Server Core installation): affected >= 6.2.9200.0 and < 6.2.9200.23435
- Microsoft Windows Server 2016: affected >= 10.0.14393.0 and < 10.0.14393.4583
- Microsoft Windows Server 2016 (Server Core installation): affected >= 10.0.14393.0 and < 10.0.14393.4583
- Microsoft Windows Server 2019: affected >= 10.0.17763.0 and < 10.0.17763.2114
- Microsoft Windows Server 2019 (Server Core installation): affected >= 10.0.17763.0 and < 10.0.17763.2114
- Microsoft Windows Server version 2004: affected >= 10.0.0 and < 10.0.19041.1165
- Microsoft Windows Server version 20H2: affected >= 10.0.0 and < 10.0.19042.1165

A version outside these ranges is not a statement that it is unaffected.

## References

- [patch] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36942
- [advisory] https://www.kb.cert.org/vuls/id/405600
- [other] https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36942
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36942

---
Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.