CASCACascade Atlas

Evidence dossier

CVE-2021-42287

Active Directory Domain Services Elevation of Privilege Vulnerability

Exploited in the wild (CISA KEV since Apr 11, 2022). microsoft reports CVSS 3.1 7.5. Severity assessments differ within at least one CVSS version. EPSS estimates 77.2% exploit likelihood as of Oct 22, 2026.

76.3–91.5Priority evidence range
Evidence through Oct 22, 2026, 6:07 PM UTC

As of Oct 22, 2026

Normalized restatement

Active Directory Domain Services Elevation of Privilege Vulnerability

State
PUBLISHED
Published
Nov 10, 2021
Updated
Aug 19, 2026
Evidence coverage
72%

Evidence chronology

What was known when

Download this view's receipt →
  1. Source dateSource date omittedFirst observed by CASCA
    CISA-ADP

    Record text: CISA ADP Vulnrichment

    Inspect raw assertion
    Field
    container
    Value
    CISA ADP Vulnrichment
    Original evidence ↗
  2. Source dateSource date omittedFirst observed by CASCA
    CVE Program

    Record text: CVE Program Container

    Inspect raw assertion
    Field
    container
    Value
    CVE Program Container
    Original evidence ↗
  3. Source dateSource date omittedFirst observed by CASCA
    microsoft

    Record text: Active Directory Domain Services Elevation of Privilege Vulnerability

    Inspect raw assertion
    Field
    container
    Value
    Active Directory Domain Services Elevation of Privilege Vulnerability
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: Microsoft Active Directory Domain Services Privilege Escalation Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Microsoft Active Directory Domain Services Privilege Escalation Vulnerability
    Original evidence ↗
  5. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 77.17% probability · 99.56th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.771700000000; percentile 0.995550000000
    Original evidence ↗

Assessments differ

NVD6.5CVSS 2.0 · source date omitted
NVD8.8CVSS 3.1 · source date omitted
secure@microsoft.com7.5CVSS 3.1 · source date omitted

Values are shown separately by source and CVSS version.

ExploitationCatalog member

CISA KEV · catalog date Apr 11, 2022 · first observed Sep 1, 2026

Exploit likelihood77.17%

FIRST EPSS · score date Oct 22, 2026 · 99.6th percentile · first observed Oct 22, 2026

SeverityAssessments differ

microsoft · CVSS 3.1 · first observed Aug 19, 2026 · values shown separately below

Evidence detail

Source limits and decisions

Why each evidence state has this value

casca-unknown-reasons-v1
Exploitation statusLast verified source snapshot retained

The last verified source boundary remains in force for this claim.

Revision
evidence-policy-v1.1.0
Cutoff
Oct 22, 2026
Resolution
Review source contract
Exploit likelihoodEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Oct 22, 2026
Resolution
None
Severity assessmentAssessments differ

Eligible assertions materially conflict and remain visible side by side.

Revision
casca-direct-cvss-eligibility-v1
Cutoff
Oct 22, 2026
Resolution
Resolve conflict
Affected productsSource-reported scope

The cited source assertion is retained while canonical product linkage remains open.

Revision
casca-factor-d-obligations-v1
Cutoff
Oct 22, 2026
Resolution
Resolve identity

Source comparison

Who said what

CISA-ADPIndependent enrichment
Record text

CISA ADP Vulnrichment

Inspect raw assertion
Field
container
Value
CISA ADP Vulnrichment
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CVE ProgramDerivative copy
Record text

CVE Program Container

Inspect raw assertion
Field
container
Value
CVE Program Container
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
microsoftOriginal assertion
Record text

Active Directory Domain Services Elevation of Privilege Vulnerability

Inspect raw assertion
Field
container
Value
Active Directory Domain Services Elevation of Privilege Vulnerability
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CISA KEVOriginal assertion
Exploitation cataloged

Microsoft Active Directory Domain Services Privilege Escalation Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
Microsoft Active Directory Domain Services Privilege Escalation Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

77.17% probability · 99.56th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.771700000000; percentile 0.995550000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
8Underlying assertions
5Canonical products
8Target assertions
0Constraint assertions

Grouped from 1 configuration nodes in this exact snapshot. Visual grouping is navigational; asset exposure and root cause require cited evidence.

Identity source boundaries
  • Cpe dictionary1,775,266 records · observed through 2026-07-21T06:45:29.809Z27d65b0f-b718-4b4f-bb79-c47c68d09dfa
  • Cpe match643,502 records · observed through 2026-07-21T08:13:17.697Z955dae73-7302-438b-aee1-058d7cc5d48e

20 scope groups

microsoft · source assertedMicrosoftWindows Server 2008 R2 Service Pack 1Direct source scope
Affected: 6.1.7601.0 to before 6.1.7601.25769 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "6.1.7601.0", "lessThan": "6.1.7601.25769", "versionType": "custom"}]
microsoft · source assertedMicrosoftWindows Server 2008 R2 Service Pack 1 (Server Core installation)Direct source scope
Affected: 6.1.7601.0 to before 6.1.7601.25769 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "6.1.7601.0", "lessThan": "6.1.7601.25769", "versionType": "custom"}]
microsoft · source assertedMicrosoftWindows Server 2008 Service Pack 2Direct source scope
Affected: 6.0.6003.0 to before 6.0.6003.21282 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "6.0.6003.0", "lessThan": "6.0.6003.21282", "versionType": "custom"}]
microsoft · source assertedMicrosoftWindows Server 2008 Service Pack 2 (Server Core installation)Direct source scope
Affected: 6.0.6003.0 to before 6.0.6003.21282 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "6.0.6003.0", "lessThan": "6.0.6003.21282", "versionType": "custom"}]
microsoft · source assertedMicrosoftWindows Server 2012Direct source scope
Affected: 6.2.9200.0 to before 6.2.9200.23517 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "6.2.9200.0", "lessThan": "6.2.9200.23517", "versionType": "custom"}]
microsoft · source assertedMicrosoftWindows Server 2012 R2Direct source scope
Affected: 6.3.9600.0 to before 6.3.9600.20174 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "6.3.9600.0", "lessThan": "6.3.9600.20174", "versionType": "custom"}]
microsoft · source assertedMicrosoftWindows Server 2012 R2 (Server Core installation)Direct source scope
Affected: 6.3.9600.0 to before 6.3.9600.20174 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "6.3.9600.0", "lessThan": "6.3.9600.20174", "versionType": "custom"}]
microsoft · source assertedMicrosoftWindows Server 2012 (Server Core installation)Direct source scope
Affected: 6.2.9200.0 to before 6.2.9200.23517 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "6.2.9200.0", "lessThan": "6.2.9200.23517", "versionType": "custom"}]
microsoft · source assertedMicrosoftWindows Server 2016Direct source scope
Affected: 10.0.14393.0 to before 10.0.14393.4770 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "10.0.14393.0", "lessThan": "10.0.14393.4770", "versionType": "custom"}]
microsoft · source assertedMicrosoftWindows Server 2016 (Server Core installation)Direct source scope
Affected: 10.0.14393.0 to before 10.0.14393.4770 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "10.0.14393.0", "lessThan": "10.0.14393.4770", "versionType": "custom"}]
microsoft · source assertedMicrosoftWindows Server 2019Direct source scope
Affected: 10.0.17763.0 to before 10.0.17763.2300 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "10.0.17763.0", "lessThan": "10.0.17763.2300", "versionType": "custom"}]
microsoft · source assertedMicrosoftWindows Server 2019 (Server Core installation)Direct source scope
Affected: 10.0.17763.0 to before 10.0.17763.2300 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "10.0.17763.0", "lessThan": "10.0.17763.2300", "versionType": "custom"}]
microsoft · source assertedMicrosoftWindows Server 2022Direct source scope
Affected: 10.0.20348.0 to before 10.0.20348.350 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "10.0.20348.0", "lessThan": "10.0.20348.350", "versionType": "custom"}]
microsoft · source assertedMicrosoftWindows Server version 2004Direct source scope
Affected: 10.0.0 to before 10.0.19041.1348 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "10.0.0", "lessThan": "10.0.19041.1348", "versionType": "custom"}]
microsoft · source assertedMicrosoftWindows Server version 20H2Direct source scope
Affected: 10.0.0 to before 10.0.19041.1348 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "10.0.0", "lessThan": "10.0.19041.1348", "versionType": "custom"}]
NVD CPE · OPERATING SYSTEMmicrosoftwindows_server_2008Vulnerable target · 2 assertions
Version not applicable; Version r2Canonical identity product-217b1ab3d25f361a639824f86753d418b35aa2a816ee370bb71b5d1dd883d87aLinked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    5f422a8c-2c4e-42c8-b420-e0728037e15c
  2. cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 1
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    af07a81d-12e5-4b1d-bff9-c8d08c32ff4f
NVD CPE · OPERATING SYSTEMmicrosoftwindows_server_2012Vulnerable target · 2 assertions
Version not applicable; Version r2Canonical identity product-5a80416e92fed0cddbb3d4f3840218b448dee11159824ad25a0353da566963feLinked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 3
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    db18c4ce-5917-401e-acf7-2747084fd36e
  2. cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 2
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    a7df96f8-ba6a-4780-9ca3-f719b3f81074
NVD CPE · OPERATING SYSTEMmicrosoftwindows_server_2016Vulnerable target · 2 assertions
Any version (unconstrained) (< 10.0.14393.4770); Version 2004Canonical identity product-02e254d111ce604757a15650ef469f4f8365d6247da82ce3ac2695c3cfc7dc5fLinked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 4
    Logic
    OR
    Version bounds
    through excluding 10.0.14393.4770
    Match ID
    572bdefc-d3e8-4ff0-b91e-d21f42d2b82d
  2. cpe:2.3:o:microsoft:windows_server_2016:2004:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 5
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    0b60d940-80c7-49f0-8f4e-3f99ac15fa82
NVD CPE · OPERATING SYSTEMmicrosoftwindows_server_2019Vulnerable target · 1 assertions
Any version (unconstrained) (< 10.0.17763.2300)Canonical identity product-25a2932c0bbcb648f7e391c8b9d34c734e5085444c03c1c206b9d4c4baa80b25Linked exact
Scope supported
Inspect raw assertion
  1. cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 6
    Logic
    OR
    Version bounds
    through excluding 10.0.17763.2300
    Match ID
    74a5af5d-c59c-4093-a4c0-3be230e7637f
NVD CPE · OPERATING SYSTEMmicrosoftwindows_server_2022Vulnerable target · 1 assertions
Any version (unconstrained) (< 10.0.20348.350)Canonical identity product-d196d31962e613955a91e33e795c22dcfa7bf25173abebaca616a6350cce9ce1Linked exact
Scope supported
Inspect raw assertion
  1. cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 7
    Logic
    OR
    Version bounds
    through excluding 10.0.20348.350
    Match ID
    b662e504-15e6-4d85-8463-bbe9435790cc

Affected-product evidence

Accepted scope and product mapping

0 canonical links · 2 source-reported links

Source-reported scopeSource-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Vendor specified only by source · Product specified only by source

Source class
Direct cve affected
Assertions
15
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Oct 22, 2026
Retained assertion IDs
308fa846-6221-4727-9e66-3d091c7da56c53060e1d-f666-462b-80d4-e2dd8171601a57a02d88-3d68-4cbb-b0db-a920b0883d4d6005751d-ab2a-4320-af7c-626a07504a7e65e3a495-72c6-4066-b3ad-5056abe456e16b84078e-2576-479d-9196-69d1fc73d34370b38c89-75be-4c13-9a93-a69eef3d41127125cea6-9746-4f50-bd54-c5b62ff9c8198d422c9e-393a-4f75-b68c-b11afac521c696b153a0-b9f1-405a-8770-f2aea3270c2c97f412af-ef5b-41f8-baff-bd0ac6f47bc5b9f73d22-6e30-43e6-a78d-4e2f18c2cd29c2b19b2e-aa8d-4b38-9708-a3950cef20cadadaa3ba-7680-41c3-bcb9-e2999b795d54fdce5bf2-2e22-4b66-b4de-67cd576a02d1
Source-reported scopeSource-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Vendor specified only by source · Product specified only by source

Source class
Nvd cpe vulnerable target
Assertions
9
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Oct 22, 2026
Retained assertion IDs
3ab65062-a8a5-4a8c-9040-0bb77ffa3bc644c56ff2-459a-4920-b340-5c492094b6ca562c5ae3-fb97-4682-867b-5b6ea32bb77a72efd592-cfb7-49a1-b68e-0233aa1f6aaa94dd718b-62ad-420d-9117-4eb4c054f446a867cab8-ca52-4c3b-a41a-149ee26cc40ea9cb5900-dc34-48e4-b7b9-5c2bf03e42a6c004b4d4-6741-4634-be0f-219a9e9143eac7986ea3-b6d6-4374-aab7-1e25886057e9

Assessments

CVSS by origin

6.5
NVDCVSS 2.0 · role Primary · priority eligiblevalid_matchAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8
NVDCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.5
secure@microsoft.comCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.5
microsoftCVSS 3.1 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Direct CVE/CNA normalized decisions

7.5Priority eligible

microsoft

CVSS 3.1 · Primary · Original assertion · rank 1

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
Validation
Valid match
Recomputed
7.5
Decision reason
Evidence supported
Policy
casca-direct-cvss-eligibility-v1

Assessments are retained side by side under closed precedence. Cascade never averages CVSS.

Evidence boundaries

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; remaining scope stays source-scoped.
  • NVD-carried upstream facts remain derivative; independent corroboration requires a separately authored source.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.
  • OSV aggregation and OSV-converted NVD material are not independent corroboration.
  • Red Hat facts are vendor assertions for the exact supplied products.
  • Nonmembership and not-yet-observed states are not proof of safety.