CVE-2021-42287

Active Directory Domain Services Elevation of Privilege Vulnerability

HIGH

7.5

CVSS Score

Published: November 10, 2021 at 12:47 AM UTC

Updated: August 19, 2026 at 07:35 PM UTC

7 products affected across 1 vendorWindows Server 2016Windows Server 2019Windows Server 2012

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Severity

HIGH7.5

Exploitation

CISA KEV

Exploit prediction

EPSS 77%

SSVC

Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score77.2%

EPSS (Exploit Prediction Scoring System) estimates a 77.2% chance this CVE is exploited in the wild within the next 30 days — higher than 100% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Microsoft Active Directory Domain Services contains an unspecified vulnerability that allows for privilege escalation.

Required Action

Apply updates per vendor instructions.

Ransomware Use

Known

Added to KEV

Apr 11, 2022

Remediation Due

May 2, 2022

1642 days overdue

Notes

https://nvd.nist.gov/vuln/detail/CVE-2021-42287

Description

Active Directory Domain Services Elevation of Privilege Vulnerability

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Windows Server 2004 · Microsoft

95%

v < 10.0.19041.134810.0.0 ≤ v < 10.0.19041.134810.0.0

Affected range stops below 10.0.19041.1348, so it looks safe — our inference, not a vendor statement

Windows Server 2008 · Microsoft

95%

6.0.6003.0 ≤ v < 6.0.6003.212826.1.7601.0 ≤ v < 6.1.7601.257696.0.6003.0 6.1.7601.0 r2 sp1sp2

Affected range stops below 6.0.6003.21282, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.1.7601.25769, so it looks safe — our inference, not a vendor statement

Windows Server 2012 · Microsoft

95%

6.2.9200.0 ≤ v < 6.2.9200.235176.3.9600.0 ≤ v < 6.3.9600.201746.2.9200.0 6.3.9600.0 r2

Affected range stops below 6.2.9200.23517, so it looks safe — our inference, not a vendor statement

Affected range stops below 6.3.9600.20174, so it looks safe — our inference, not a vendor statement

Windows Server 2016 · Microsoft

95%

v < 10.0.14393.477010.0.14393.0 ≤ v < 10.0.14393.477010.0.14393.0

Affected range stops below 10.0.14393.4770, so it looks safe — our inference, not a vendor statement

Windows Server 2019 · Microsoft

95%

v < 10.0.17763.230010.0.17763.0 ≤ v < 10.0.17763.230010.0.17763.0

Affected range stops below 10.0.17763.2300, so it looks safe — our inference, not a vendor statement

Windows Server 2022 · Microsoft

95%

v < 10.0.20348.35010.0.20348.0 ≤ v < 10.0.20348.35010.0.20348.0

Affected range stops below 10.0.20348.350, so it looks safe — our inference, not a vendor statement

Windows Server 20H2 · Microsoft

95%

v < 10.0.19042.134810.0.0 ≤ v < 10.0.19041.134810.0.0

Affected range stops below 10.0.19041.1348, so it looks safe — our inference, not a vendor statement

Affected range stops below 10.0.19042.1348, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

PatchVendor Advisory

Source: [email protected]

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42287

US Government Resource

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42287

Vendor AdvisoryPatch

Source: cverecord

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-42287

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHmicrosoft

Vector?

Quick Info

StatusANALYZED

CWE

NVD-CWE-noinfo

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