CASCACascade Atlas

Evidence dossier

CVE-2021-26855

Microsoft Exchange Server Remote Code Execution Vulnerability

Exploited in the wild (CISA KEV since Nov 3, 2021). microsoft reports CVSS 3.1 9.1. EPSS estimates 100.0% exploit likelihood as of Oct 6, 2026.

82.7–97.9Priority evidence range
Evidence through Oct 22, 2026, 6:07 PM UTC

As of Oct 22, 2026

Normalized restatement

Microsoft Exchange Server Remote Code Execution Vulnerability

State
PUBLISHED
Published
Mar 2, 2021
Updated
Aug 19, 2026
Evidence coverage
85%

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: Microsoft Exchange Server Remote Code Execution Vulnerability

    Inspect raw assertion
    Field
    container
    Value
    Microsoft Exchange Server Remote Code Execution Vulnerability
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: Microsoft Exchange Server Remote Code Execution Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Microsoft Exchange Server Remote Code Execution Vulnerability
    Original evidence ↗
  5. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 100% probability · 99.99th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.999960000000; percentile 0.999890000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date Nov 3, 2021 · first observed Sep 1, 2026

Exploit likelihood100.00%

FIRST EPSS · score date Oct 6, 2026 · 100th percentile · first observed Oct 7, 2026

SeverityCVSS 9.1

microsoft · CVSS 3.1 · first observed Aug 19, 2026 · same-version scores align in this snapshot

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 assessmentEvidence supported

Eligible evidence is present for this bounded claim.

Revision
casca-direct-cvss-eligibility-v1
Cutoff
Oct 22, 2026
Resolution
None
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

Microsoft Exchange Server Remote Code Execution Vulnerability

Inspect raw assertion
Field
container
Value
Microsoft Exchange Server Remote Code Execution Vulnerability
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CISA KEVOriginal assertion
Exploitation cataloged

Microsoft Exchange Server Remote Code Execution Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
Microsoft Exchange Server Remote Code Execution Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

100% probability · 99.99th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.999960000000; percentile 0.999890000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
24Underlying assertions
1Canonical products
24Target 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

25 scope groups

microsoft · source assertedMicrosoftMicrosoft Exchange Server 2013 Cumulative Update 21Direct source scope
Affected: 15.00.0 to before 15.00.1395.012 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.00.0", "lessThan": "15.00.1395.012", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2013 Cumulative Update 22Direct source scope
Affected: 15.00.0 to before 15.00.1473.006 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.00.0", "lessThan": "15.00.1473.006", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2013 Cumulative Update 23Direct source scope
Affected: 15.00.0 to before 15.00.1497.012 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.00.0", "lessThan": "15.00.1497.012", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2016 Cumulative Update 10Direct source scope
Affected: 15.01.0 to before 15.01.1531.012 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.01.0", "lessThan": "15.01.1531.012", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2016 Cumulative Update 11Direct source scope
Affected: 15.01.0 to before 15.01.1591.018 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.01.0", "lessThan": "15.01.1591.018", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2016 Cumulative Update 12Direct source scope
Affected: 15.01.0 to before 15.01.1713.010 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.01.0", "lessThan": "15.01.1713.010", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2016 Cumulative Update 13Direct source scope
Affected: 15.01.0 to before 15.01.1779.008 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.01.0", "lessThan": "15.01.1779.008", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2016 Cumulative Update 14Direct source scope
Affected: 15.01.0 to before 15.01.1847.012 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.01.0", "lessThan": "15.01.1847.012", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2016 Cumulative Update 15Direct source scope
Affected: 15.01.0 to before 15.01.1913.012 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.01.0", "lessThan": "15.01.1913.012", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2016 Cumulative Update 16Direct source scope
Affected: 15.01.0 to before 15.01.1979.008 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.01.0", "lessThan": "15.01.1979.008", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2016 Cumulative Update 17Direct source scope
Affected: 15.01.0 to before 15.01.2044.013 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.01.0", "lessThan": "15.01.2044.013", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2016 Cumulative Update 18Direct source scope
Affected: 15.01.0 to before 15.01.2106.013 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.01.0", "lessThan": "15.01.2106.013", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2016 Cumulative Update 19Direct source scope
Affected: 15.01.0 to before 15.01.2176.009 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.01.0", "lessThan": "15.01.2176.009", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2016 Cumulative Update 8Direct source scope
Affected: 15.01.0 to before 15.01.1415.010 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.01.0", "lessThan": "15.01.1415.010", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2016 Cumulative Update 9Direct source scope
Affected: 15.01.0 to before 15.01.1466.016 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.01.0", "lessThan": "15.01.1466.016", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2019Direct source scope
Affected: 15.02.0 to before 15.02.0221.018 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.02.0", "lessThan": "15.02.0221.018", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2019 Cumulative Update 1Direct source scope
Affected: 15.02.0 to before 15.01.1979.006 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.02.0", "lessThan": "15.01.1979.006", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2019 Cumulative Update 2Direct source scope
Affected: 15.02.0 to before 15.02.0397.011 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.02.0", "lessThan": "15.02.0397.011", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2019 Cumulative Update 3Direct source scope
Affected: 15.02.0 to before 15.02.0464.015 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.02.0", "lessThan": "15.02.0464.015", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2019 Cumulative Update 4Direct source scope
Affected: 15.02.0 to before 15.02.0659.012 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.02.0", "lessThan": "15.02.0659.012", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2019 Cumulative Update 5Direct source scope
Affected: 15.02.0 to before 15.02.0595.008 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.02.0", "lessThan": "15.02.0595.008", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2019 Cumulative Update 6Direct source scope
Affected: 15.02.0 to before 15.02.0529.013 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.02.0", "lessThan": "15.02.0529.013", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2019 Cumulative Update 7Direct source scope
Affected: 15.02.0 to before 15.02.0721.013 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.02.0", "lessThan": "15.02.0721.013", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Exchange Server 2019 Cumulative Update 8Direct source scope
Affected: 15.02.0 to before 15.02.0792.010 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.02.0", "lessThan": "15.02.0792.010", "versionType": "custom"}]
NVD CPE · APPLICATIONmicrosoftexchange_serverVulnerable target · 24 assertions
Version 2013; Version 2016; Version 2019Canonical identity product-d87daca995d075bf30565cc429e7242a47683272975068df1d327ec1d8ff609cLinked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_17:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 10
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    079e1e3f-ff25-4b0d-ac98-191d6455a014
  2. cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_12:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 5
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    ccf101be-27fd-4e2d-a694-c606bd3d1ed7
  3. cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_9:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 14
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    69af19dc-3d65-49a8-a85f-511085cdf27b
  4. cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_16:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 9
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    4830d6a9-af74-480c-8f69-8648cd619980
  5. cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_19:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 12
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    28fca0e8-7d27-4746-9731-91b834ca3e64
  6. cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_2:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 17
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    ee320413-d2c9-4b28-89bf-361b44a3f0ff
  7. cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_14:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 7
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    55284cf7-0d04-4216-83fe-4b1f9ca94207
  8. cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_10:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 3
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    63e362cb-cf75-4b7e-a4b1-d6d84afcbb68
  9. cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_7:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 22
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    36ce5c6d-9a04-41f5-ae7c-265779833649
  10. cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 2
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    da166f2a-d83b-4d50-ad0b-668d813e0585
  11. cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_4:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 19
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    73b3b3fe-7e85-4b86-a983-2c410ffef4b8
  12. cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_6:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 21
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    d4ab3c25-cea8-4d66-aee4-953c8b17911a
  13. cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_5:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 20
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    8a9fb275-7f17-48b2-b528-be89309d2af5
  14. cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_21:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    b560f8fd-068e-4a16-a37f-a62dce88fcf2
  15. cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_3:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 18
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    104f96dc-e280-4e0a-8586-b043b55888c2
  16. cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_11:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 4
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    9be04790-85a2-4078-88ce-1787bc5172e7
  17. cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_8:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 23
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    44ecf39a-1de1-4870-a494-06a53494338d
  18. cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_15:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 8
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    ca2ce223-aa49-49e6-ac32-59270eff55ad
  19. cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_22:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 1
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    751fd35f-2ecd-4b75-9589-988cc6ad3058
  20. cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_18:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 11
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    29805ec7-6403-44b9-91ec-109c087e98eb
  21. cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_1:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 16
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    051de6c4-7456-4c42-bc51-253208aadb4e
  22. cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_13:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 6
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    4df5bdb5-205d-4b64-a49a-0152afcf4a13
  23. cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_8:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 13
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    075e907f-af2f-4c31-86c7-51972be412a1
  24. cpe:2.3:a:microsoft:exchange_server:2019:-:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 15
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    40d8a6db-9225-4a3f-ad76-192f6cccf002

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
24
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Oct 22, 2026
Retained assertion IDs
0293b36a-328f-4570-9042-1cff9d9ac4ba0658d33f-fcc7-419e-99a1-97ca93e7e6200ca27017-6273-4ed3-b746-54b90a74af2a1552a08c-57c1-4076-94d6-89b4c6a7e3c727405b77-dd02-4bd2-8664-8a2ebcc335763039f2ea-bcdc-4d57-b225-5cd132d044ce48cf87fb-bf9a-4a0b-92af-a3bf13e26e4157593dbd-ced9-4e09-8c58-8470e5cafc2f5d8aa86f-5465-491b-afde-c2931047b3a06b20b3ec-bf27-4f0d-a5a0-03910ad682a86ce4ff8e-dac7-4439-8728-07c4b4bb2f94763d61ae-a6f4-4ed0-8f02-a8f2c274464178d1aa46-410d-4359-beea-9d60aaaa4e1e791e83cf-ebea-4a59-990f-5b137742f9a379205632-88f6-4890-938e-9c7d34b47ca88b6ade81-caf3-4534-b088-ac8ebfc36db197f61a36-f7c9-4284-a738-b48b6f91a60c97fc215b-c006-4de2-ab8e-c37d8ca0ec6ba42b4d10-57cf-46ed-97d5-91e21ded30b8b9a8573c-b3e4-4d1d-87e7-9cfbf1030bf1d1a974fb-7b4f-4915-bef4-ec68d09ff63dd87e65c9-3ab2-4a00-b751-bb576e3f15f8eb5f5761-4edf-4e15-95a6-f171cb90a5f1f01bf94d-8d10-4097-80ae-4066c3a65ebd
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
24
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Oct 22, 2026
Retained assertion IDs
0247d418-fb88-45eb-93ad-e3d082f3acec106a2619-e111-4e8c-be75-dc02beb57d541ae42a09-2103-4733-a69a-bda54047c08a1b11c1af-0990-4375-9d9f-9fec4b86334742810465-2784-4146-9896-1f868129fad0428f5b44-9861-443c-a221-7502b9dcf70046639238-6bc5-4d5d-ad34-1aa67c45bb40539df05d-8f8d-4c22-9967-34207f47ccbe677ae5f3-7ff6-4442-9c24-211245989f226bc3a7d7-1319-4d09-8cdd-bd4078d38dc16c158e41-f28b-43c3-8109-08426f8ae55d7a4e0271-421f-4aeb-b771-ddb8242eb15f87c47d18-693a-4829-906c-b709950a5b3a9beacdb0-cf7c-4758-8d18-91d21e6bc986a486b828-e80f-4704-82ef-2c26a8e47a8ba636d3e2-879d-4f6d-9365-69488e1c26e6ab79e1a8-9eaa-46b0-ac52-68e845046f35ade28070-dc9a-4827-ae9c-9e16bb26d09cbe0ecae4-35fb-465b-8171-c884f837ca65c0923da5-ba48-4e45-86e4-aaa243d21523e2d0a7a9-2fcc-46f0-bbf2-d72b4e819ab2f017eb3e-a4a9-4774-b8d0-bd2bcd0812b0f1d91f48-c7c0-4df7-badb-eb59c2e0df83f94776ed-ad6d-4618-989a-34bc7c6945cb

Assessments

CVSS by origin

7.5
NVDCVSS 2.0 · role Primary · priority eligiblevalid_matchAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8
NVDCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.1
secure@microsoft.comCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
9.1
microsoftCVSS 3.1 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:F/RL:O/RC:C

Direct CVE/CNA normalized decisions

9.1Priority eligible

microsoft

CVSS 3.1 · Primary · Original assertion · rank 1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:F/RL:O/RC:C
Validation
Valid match
Recomputed
9.1
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.