OnlyPatch
Windows Active Directory

CVE-2021-42287 — Active Directory Domain Services Elevation of Privilege Vulnerability

Important CVSS 7.5 EPSS 0.74265 2021-11 archive

Executive Summary

None

Overview

7.5
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Elevation of Privilege
Released Nov 9 2021
Last Updated Nov 9 2021
Publicly Disclosed No
CISA KEV Listed (added 2022-04-11)
Known Exploits None Known
EPSS Score 0.74265 — 0.99443 percentile
NVD CVSS 7.5 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.5

EPSS Score

0.74265
probability of exploitation in the next 30 days
0.99443 percentile - updated 2026-08-14
View on FIRST.org

Affected Products

8 affected products
Product KB Article Severity Impact Restart Required
Windows Server 2008 for 32-bit Systems Service Pack 2 5007263 (Monthly Rollup) 5007246 (Security Only) Important Elevation of Privilege 5006736 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.21282 Yes 5007263 5007246 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 5007263 (Monthly Rollup) 5007246 (Security Only) Important Elevation of Privilege 5006736 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.21282 Yes 5007263 5007246 Windows Server 2008 for x64-based Systems Service Pack 2 5007263 (Monthly Rollup) 5007246 (Security Only) Important Elevation of Privilege 5006736 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.21282 Yes 5007263 5007246 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 5007263 (Monthly Rollup) 5007246 (Security Only) Important Elevation of Privilege 5006736 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.21282 Yes 5007263 5007246 Windows Server 2008 R2 for x64-based Systems Service Pack 1 5007236 (Monthly Rollup) 5007233 (Security Only) Important Elevation of Privilege 5006743 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.1.7601.25769 Yes 5007236 5007233 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 5007236 (Monthly Rollup) 5007233 (Security Only) Important Elevation of Privilege 5006743 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.1.7601.25769 Yes 5007236 5007233 Windows Server 2012 5007260 (Monthly Rollup) 5007245 (Security Only) Important Elevation of Privilege 5006739 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.2.9200.23517 Yes 5007260 5007245 Windows Server 2012 (Server Core installation) 5007260 (Monthly Rollup) 5007245 (Security Only) Important Elevation of Privilege 5006739 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.2.9200.23517 Yes 5007260 5007245 Windows Server 2012 R2 5007247 (Monthly Rollup) 5007255 (Security Only) Important Elevation of Privilege 5006714 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.3.9600.20174 Yes 5007247 5007255 Windows Server 2012 R2 (Server Core installation) 5007247 (Monthly Rollup) 5007255 (Security Only) Important Elevation of Privilege 5006714 Base: 7.5 Temporal: 6.5 Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.3.9600.20174 Yes 5007247 5007255 Windows Server 2016 5007192 (Security Update) Important Elevation of Privilege Yes
Windows Server 2016 (Server Core installation) 5007192 (Security Update) Important Elevation of Privilege Yes
Windows Server 2019 5007206 (Security Update) Important Elevation of Privilege Yes
Windows Server 2019 (Server Core installation) 5007206 (Security Update) Important Elevation of Privilege Yes
Windows Server 2022 5007205 (Security Update) Important Elevation of Privilege Yes
Windows Server 2022 (Server Core installation) 5007205 (Security Update) Important Elevation of Privilege Yes
Windows Server, version 2004 (Server Core installation) 5007186 (Security Update) Important Elevation of Privilege Yes
Windows Server, version 20H2 (Server Core Installation) 5007186 (Security Update) Important Elevation of Privilege Yes

Patches

4 patches
Article Type Restart
5007192 Security Update Yes
5007206 Security Update Yes
5007205 Security Update Yes
5007186 Security Update Yes

Exploits & PoC

7 public PoCs
RepositoryStarsPublishedDescription
cube0x0/noPac 1412 2021-12-11 CVE-2021-42287/CVE-2021-42278 Scanner & Exploiter.
knightswd/NoPacScan 87 2022-01-07 NoPacScan is a CVE-2021-42287/CVE-2021-42278 Scanner,it scan for more domain controllers than other script
ricardojba/Invoke-noPac 62 2021-12-13 .Net Assembly loader for the [CVE-2021-42287 - CVE-2021-42278] Scanner & Exploit noPac
XiaoliChan/Invoke-sAMSpoofing 39 2022-04-01 CVE-2021-42287/CVE-2021-42278 exploits in powershell
TryA9ain/noPac 14 2022-12-22 CVE-2021-42287/CVE-2021-42278 Exploiter
DanielFEXKEX/CVE-Scanner 2 2025-04-26 CVE-2021-42287/CVE-2021-42278/OTHER Scanner & Exploiter.
Chrisync/CVE-Scanner 0 2025-04-29 CVE-2021-42287/CVE-2021-42278/OTHER Scanner & Exploiter.

Detection Rules

Detection available

Sigma rules 3

Win Susp Computer Name Containing Samtheadmin critical Suspicious Computer Account Name Change CVE-2021-42287 high Potential CVE-2021-42287 Exploitation Attempt medium

Acknowledgments

Andrew Bartlett of Catalyst IT

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