CVE-2021-42287

mediumpriority · act · 90OT risk · criticalKEV · exploitedEPSS 0.772 · 100 %ileexploit · PoCEURUUS

grimoire priorityP0 · Act now

Exploitable?

Yes · in the wild

CISA KEV · 7 exploits · PoC

Likely / severe?

77.2% (100th) EPSS

CVSS 6.5 · medium

Is it mine?

77 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · msrc_csaf

added 2022-04-11remediate by 2022-05-02

required action Apply updates per vendor instructions.

EPSS · scored 2026-10-27

Microsoft Active Directory Domain Services Privilege Escalation Vulnerability

Active Directory Domain Services Elevation of Privilege Vulnerability

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedWindows Server 2008 R2 for x64-based Systems Service Pack 1msrc_csaf
6.1.7601.25769:Security Only:https://support.microsoft.com/help/5007233
https://support.microsoft.com/help/5007233
FixedWindows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)msrc_csaf
6.1.7601.25769:Security Only:https://support.microsoft.com/help/5007233
https://support.microsoft.com/help/5007233
FixedWindows Server 2008 for 32-bit Systems Service Pack 2msrc_csaf
6.0.6003.21282:Security Only:https://support.microsoft.com/help/5007246
https://support.microsoft.com/help/5007246
FixedWindows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)msrc_csaf
6.0.6003.21282:Security Only:https://support.microsoft.com/help/5007246
https://support.microsoft.com/help/5007246
FixedWindows Server 2008 for x64-based Systems Service Pack 2msrc_csaf
6.0.6003.21282:Security Only:https://support.microsoft.com/help/5007246
https://support.microsoft.com/help/5007246
FixedWindows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)msrc_csaf
6.0.6003.21282:Security Only:https://support.microsoft.com/help/5007246
https://support.microsoft.com/help/5007246
FixedWindows Server 2012msrc_csaf
6.2.9200.23517:Security Only:https://support.microsoft.com/help/5007245
https://support.microsoft.com/help/5007245
FixedWindows Server 2012 (Server Core installation)msrc_csaf
6.2.9200.23517:Security Only:https://support.microsoft.com/help/5007245
https://support.microsoft.com/help/5007245
FixedWindows Server 2012 R2msrc_csaf
6.3.9600.20174:Monthly Rollup:https://support.microsoft.com/help/5007247
https://support.microsoft.com/help/5007247
FixedWindows Server 2012 R2 (Server Core installation)msrc_csaf
6.3.9600.20174:Monthly Rollup:https://support.microsoft.com/help/5007247
https://support.microsoft.com/help/5007247
FixedWindows Server 2016msrc_csaf
10.0.14393.4770:Security Update:https://support.microsoft.com/help/5007192
https://support.microsoft.com/help/5007192
FixedWindows Server 2016 (Server Core installation)msrc_csaf
10.0.14393.4770:Security Update:https://support.microsoft.com/help/5007192
https://support.microsoft.com/help/5007192
FixedWindows Server 2019msrc_csaf
10.0.17763.2300:Security Update:https://support.microsoft.com/help/5007206
https://support.microsoft.com/help/5007206
FixedWindows Server 2019 (Server Core installation)msrc_csaf
10.0.17763.2300:Security Update:https://support.microsoft.com/help/5007206
https://support.microsoft.com/help/5007206
FixedWindows Server 2022msrc_csaf
10.0.20348.350:Security Update:https://support.microsoft.com/help/5007205
https://support.microsoft.com/help/5007205
FixedWindows Server 2022 (Server Core installation)msrc_csaf
10.0.20348.350:Security Update:https://support.microsoft.com/help/5007205
https://support.microsoft.com/help/5007205
FixedWindows Server, version 2004 (Server Core installation)msrc_csaf
10.0.19041.1348:Security Update:https://support.microsoft.com/help/5007186
https://support.microsoft.com/help/5007186
FixedWindows Server, version 20H2 (Server Core Installation)msrc_csaf
10.0.19041.1348:Security Update:https://support.microsoft.com/help/5007186
https://support.microsoft.com/help/5007186

cvss

Technical severity, 0–10. One row per scoring source.

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.5–8.8

v2.06.5mediumAV:N/AC:L/Au:S/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8 · impact 6.4

v2.06.5mediumAV:N/AC:L/Au:S/C:P/I:P/A:P/E:Hsecondary · CVSS-BT (t0sche)

v3.18.8highAV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.17.5highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · secure@microsoft.com USexploitability 1.6 · impact 5.9

v3.17.5highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · Microsoft Security Response Center US

v3.17.5highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · ENISA EU

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · NVD / NIST USexploitability 2.8 · impact 5.9

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: active · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-269US

exploits (7)

Public proof-of-concept and weaponised exploit code.

Chrisync/CVE-ScannerCVE-2021-42287/CVE-2021-42278/OTHER Scanner & Exploiter.PoC · poc_in_github
DanielFEXKEX/CVE-ScannerCVE-2021-42287/CVE-2021-42278/OTHER Scanner & Exploiter.PoC · poc_in_github
TryA9ain/noPacCVE-2021-42287/CVE-2021-42278 ExploiterPoC · poc_in_github
XiaoliChan/Invoke-sAMSpoofingCVE-2021-42287/CVE-2021-42278 exploits in powershellPoC · poc_in_github
cube0x0/noPacCVE-2021-42287/CVE-2021-42278 Scanner & Exploiter.PoC · poc_in_github
knightswd/NoPacScanNoPacScan is a CVE-2021-42287/CVE-2021-42278 Scanner,it scan for more domain controllers than other scriptPoC · poc_in_github

affected products (77)

Products and version ranges known to be affected.

Microsoft Windows Server 2008 R2 Service Pack 16.1.0 → 6.1.7601.25769enisa_euvdEU
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation)6.0.0 → 6.1.7601.25769enisa_euvdEU
Microsoft Windows Server 2008 Service Pack 26.0.0 → 6.0.6003.21282enisa_euvdEU
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation)6.0.0 → 6.0.6003.21282enisa_euvdEU
Microsoft Windows Server 20126.2.0 → 6.2.9200.23517enisa_euvdEU
Microsoft Windows Server 2012 (Server Core installation)6.2.0 → 6.2.9200.23517enisa_euvdEU
Microsoft Windows Server 2012 R26.3.0 → 6.3.9600.20174enisa_euvdEU
Microsoft Windows Server 2012 R2 (Server Core installation)6.3.0 → 6.3.9600.20174enisa_euvdEU
Microsoft Windows Server 201610.0.0 → 10.0.14393.4770enisa_euvdEU
Microsoft Windows Server 2016 (Server Core installation)10.0.0 → 10.0.14393.4770enisa_euvdEU
Microsoft Windows Server 201910.0.0 → 10.0.17763.2300enisa_euvdEU
Microsoft Windows Server 2019 (Server Core installation)10.0.0 → 10.0.17763.2300enisa_euvdEU
Microsoft Windows Server 202210.0.0 → 10.0.20348.350enisa_euvdEU
Microsoft Windows Server version 200410.0.0 → 10.0.19041.1348enisa_euvdEU
Microsoft Windows Server version 20H210.0.0 → 10.0.19041.1348enisa_euvdEU
Microsoft Corp Windows Server 2004 (Server Core Installation)all versionsfstec_bduRU
Microsoft Corp Windows Server 2008 R2 Service Pack 1all versionsfstec_bduRU
Microsoft Corp Windows Server 2008 R2 Service Pack 1 (Server Core installation)all versionsfstec_bduRU
Microsoft Corp Windows Server 2008 R2 Service Pack 2 (Server Core installation)all versionsfstec_bduRU
Microsoft Corp Windows Server 2008 Service Pack 2all versionsfstec_bduRU

showing 20 of 77

advisories (1)

Vendor and ecosystem advisories describing this.

msrc_CVE-2021-42287Active Directory Domain Services Elevation of Privilege Vulnerability2021-11-09csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu msrc_csaf NVD CVE.org MITRE

published 2021-11-10modified 2026-08-19

references (9)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

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