Reference page — cumulative record through Wednesday, October 7, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2021-42287
Microsoft Windows Server 2008 R2 Service Pack 1 — Active Directory Domain Services Elevation of Privilege Vulnerability
AV AC PR UI S C I A CVSS EPSS %ile KEV
N H L N U H H H 7.5 .7717 99.5 YES
AFFECTED
Product Versions Fixed
Windows Server 2008 R2 Service Pack 1 6.1.7601.0 – —
Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.0 – —
Windows Server 2008 Service Pack 2 6.0.6003.0 – —
Windows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.0 – —
Windows Server 2012 6.2.9200.0 – —
Windows Server 2012 (Server Core installation) 6.2.9200.0 – —
Windows Server 2012 R2 6.3.9600.0 – —
Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 – —
Windows Server 2016 10.0.14393.0 – —
Windows Server 2016 (Server Core installation) 10.0.14393.0 – —
+ 5 more
TIMELINE
Oct 12 Reserved by microsoft
Apr 11 Added to CISA KEV, remediation due 2022-05-02
Apr 11 Published (CNA: microsoft)
Description
Active Directory Domain Services Elevation of Privilege Vulnerability
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| October 12, 2021 | Reserved | Reserved by microsoft |
| April 11, 2022 | KEV ADDED | Added to CISA KEV, remediation due 2022-05-02 |
| April 11, 2022 | Published | Published (CNA: microsoft) |
Affected
Affected products and packages — 15 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Microsoft | Windows Server 2008 R2 Service Pack 1 | — | 6.1.7601.0 | — |
| Microsoft | Windows Server 2008 R2 Service Pack 1 (Server Core installation) | — | 6.1.7601.0 | — |
| Microsoft | Windows Server 2008 Service Pack 2 | — | 6.0.6003.0 | — |
| Microsoft | Windows Server 2008 Service Pack 2 (Server Core installation) | — | 6.0.6003.0 | — |
| Microsoft | Windows Server 2012 | — | 6.2.9200.0 | — |
| Microsoft | Windows Server 2012 (Server Core installation) | — | 6.2.9200.0 | — |
| Microsoft | Windows Server 2012 R2 | — | 6.3.9600.0 | — |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | — | 6.3.9600.0 | — |
| Microsoft | Windows Server 2016 | — | 10.0.14393.0 | — |
| Microsoft | Windows Server 2016 (Server Core installation) | — | 10.0.14393.0 | — |
| Microsoft | Windows Server 2019 | — | 10.0.17763.0 | — |
| Microsoft | Windows Server 2019 (Server Core installation) | — | 10.0.17763.0 | — |
| Microsoft | Windows Server 2022 | — | 10.0.20348.0 | — |
| Microsoft | Windows Server version 2004 | — | 10.0.0 | — |
| Microsoft | Windows Server version 20H2 | — | 10.0.0 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-42287 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, October 7, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
