# CVE-2021-42278

Active Directory Domain Services Elevation of Privilege Vulnerability

- Page: https://www.vulneraibility.com/cve/CVE-2021-42278
- CVSS: 7.5
- Known exploited: yes, in CISA KEV since 2022-04-11; CISA due date 2022-05-02; known ransomware use
- EPSS: 73.30% (percentile 99.5)
- Unvetted proof-of-concept code on GitHub: 6 GitHub proofs of concept (first 2021-12-11)
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2021-11-09)
- Published: 2021-11-10

## Affected versions

- Microsoft Windows Server 2008 R2 Service Pack 1: affected >= 6.1.7601.0 and < 6.1.7601.25769
- Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation): affected >= 6.1.7601.0 and < 6.1.7601.25769
- Microsoft Windows Server 2008 Service Pack 2: affected >= 6.0.6003.0 and < 6.0.6003.21282
- Microsoft Windows Server 2008 Service Pack 2 (Server Core installation): affected >= 6.0.6003.0 and < 6.0.6003.21282
- Microsoft Windows Server 2012: affected >= 6.2.9200.0 and < 6.2.9200.23517
- Microsoft Windows Server 2012 R2: affected >= 6.3.9600.0 and < 6.3.9600.20174
- Microsoft Windows Server 2012 R2 (Server Core installation): affected >= 6.3.9600.0 and < 6.3.9600.20174
- Microsoft Windows Server 2012 (Server Core installation): affected >= 6.2.9200.0 and < 6.2.9200.23517
- Microsoft Windows Server 2016: affected >= 10.0.14393.0 and < 10.0.14393.4770
- Microsoft Windows Server 2016 (Server Core installation): affected >= 10.0.14393.0 and < 10.0.14393.4770
- Microsoft Windows Server 2019: affected >= 10.0.17763.0 and < 10.0.17763.2300
- Microsoft Windows Server 2019 (Server Core installation): affected >= 10.0.17763.0 and < 10.0.17763.2300
- Microsoft Windows Server 2022: affected >= 10.0.20348.0 and < 10.0.20348.350
- Microsoft Windows Server version 2004: affected >= 10.0.0 and < 10.0.19041.1348
- Microsoft Windows Server version 20H2: affected >= 10.0.0 and < 10.0.19042.1348

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

## References

- [patch] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-42278
- [other] https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42278
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42278

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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.