Active Directory Domain Services Elevation of Privilege Vulnerability

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Summary

CVECVE-2021-42278
StatePUBLISHED
Assignermicrosoft
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-11-10 01:19:44 UTC
Updated2026-08-19 19:22:57 UTC
DescriptionActive Directory Domain Services Elevation of Privilege Vulnerability

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.720270000 probability, percentile 0.993810000 (date 2026-08-21)

CISA KEV: Listed on 2022-04-11; due 2022-05-02; ransomware use Known

Problem Types: NVD-CWE-noinfo | Elevation of Privilege | CWE-noinfo Not enough information

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS7.5HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
2.0[email protected]Primary6.5AV:N/AC:L/Au:S/C:P/I:P/A:P

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
Single
Confidentiality
Partial
Integrity
Partial
Availability
Partial

AV:N/AC:L/Au:S/C:P/I:P/A:P

CISA Known Exploited Vulnerability

VendorMicrosoft
ProductActive Directory
NameMicrosoft Active Directory Domain Services Privilege Escalation Vulnerability
Required ActionApply updates per vendor instructions.
Noteshttps://nvd.nist.gov/vuln/detail/CVE-2021-42278

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Microsoft Windows Server 2004 All All All All
Operating System Microsoft Windows Server 2008 - sp2 All All
Operating System Microsoft Windows Server 2008 r2 sp1 All All
Operating System Microsoft Windows Server 2012 - All All All
Operating System Microsoft Windows Server 2012 r2 All All All
Operating System Microsoft Windows Server 2016 All All All All
Operating System Microsoft Windows Server 2019 All All All All
Operating System Microsoft Windows Server 2022 All All All All
Operating System Microsoft Windows Server 20h2 All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Microsoft Windows Server 2008 R2 Service Pack 1 affected 6.1.7601.0 6.1.7601.25769 custom x64-based Systems
CNA Microsoft Windows Server 2008 R2 Service Pack 1 Server Core Installation affected 6.1.7601.0 6.1.7601.25769 custom x64-based Systems
CNA Microsoft Windows Server 2008 Service Pack 2 affected 6.0.6003.0 6.0.6003.21282 custom 32-bit Systems, x64-based Systems
CNA Microsoft Windows Server 2008 Service Pack 2 Server Core Installation affected 6.0.6003.0 6.0.6003.21282 custom 32-bit Systems, x64-based Systems
CNA Microsoft Windows Server 2012 affected 6.2.9200.0 6.2.9200.23517 custom x64-based Systems
CNA Microsoft Windows Server 2012 Server Core Installation affected 6.2.9200.0 6.2.9200.23517 custom x64-based Systems
CNA Microsoft Windows Server 2012 R2 affected 6.3.9600.0 6.3.9600.20174 custom x64-based Systems
CNA Microsoft Windows Server 2012 R2 Server Core Installation affected 6.3.9600.0 6.3.9600.20174 custom x64-based Systems
CNA Microsoft Windows Server 2016 affected 10.0.14393.0 10.0.14393.4770 custom x64-based Systems
CNA Microsoft Windows Server 2016 Server Core Installation affected 10.0.14393.0 10.0.14393.4770 custom x64-based Systems
CNA Microsoft Windows Server 2019 affected 10.0.17763.0 10.0.17763.2300 custom x64-based Systems
CNA Microsoft Windows Server 2019 Server Core Installation affected 10.0.17763.0 10.0.17763.2300 custom x64-based Systems
CNA Microsoft Windows Server 2022 affected 10.0.20348.0 10.0.20348.350 custom x64-based Systems
CNA Microsoft Windows Server Version 2004 affected 10.0.0 10.0.19041.1348 custom x64-based Systems
CNA Microsoft Windows Server Version 20H2 affected 10.0.0 10.0.19042.1348 custom x64-based Systems

References

ReferenceSourceLinkTags
msrc.microsoft.com/update-guide/vulnerability/CVE-2021-42278 [email protected] msrc.microsoft.com Patch, Vendor Advisory
Security Update Guide - Microsoft Security Response Center af854a3a-2127-422b-91ae-364da2661108 portal.msrc.microsoft.com Patch, Vendor Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog 134c704f-9b21-4f2e-91b3-4a467353bcc0 www.cisa.gov US Government Resource
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
CISA Known Exploited Vulnerabilities catalog CISA www.cisa.gov kev

Additional Advisory Data

SourceTimeEvent
ADP2022-04-11T00:00:00.000ZCVE-2021-42278 added to CISA KEV

Legacy QID Mappings

  • 91835 Microsoft Active Directory Domain Services (AD DS) Elevation of Privilege Vulnerability - November 2021

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