CASCACascade Atlas

Evidence dossier

CVE-2021-42292

Microsoft Excel Security Feature Bypass Vulnerability

Exploited in the wild (CISA KEV since Nov 17, 2021). microsoft reports CVSS 3.1 7.8. EPSS estimates 43.0% exploit likelihood as of Aug 27, 2026.

77.2–82.3Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

Microsoft Excel Security Feature Bypass Vulnerability

State
PUBLISHED
Published
Nov 10, 2021
Updated
Oct 21, 2025
Evidence coverage
92%

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 Excel Security Feature Bypass Vulnerability

    Inspect raw assertion
    Field
    container
    Value
    Microsoft Excel Security Feature Bypass Vulnerability
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: Microsoft Excel Security Feature Bypass

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Microsoft Excel Security Feature Bypass
    Original evidence ↗
  5. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 43% probability · 98.62th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.430050000000; percentile 0.986200000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date Nov 17, 2021 · first observed Jul 19, 2026

Exploit likelihood43.00%

FIRST EPSS · score date Aug 27, 2026 · 98.6th percentile · first observed Aug 27, 2026

SeverityCVSS 7.8

microsoft · CVSS 3.1 · first observed Jul 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 statusEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Aug 27, 2026
Resolution
None
Exploit likelihoodEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Aug 27, 2026
Resolution
None
Severity assessmentEvidence supported

Eligible evidence is present for this bounded claim.

Revision
casca-direct-cvss-eligibility-v1
Cutoff
Aug 27, 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
Aug 27, 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 Excel Security Feature Bypass Vulnerability

Inspect raw assertion
Field
container
Value
Microsoft Excel Security Feature Bypass Vulnerability
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CISA KEVOriginal assertion
Exploitation cataloged

Microsoft Excel Security Feature Bypass

Inspect raw assertion
Field
observed_exploitation
Value
Microsoft Excel Security Feature Bypass
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

43% probability · 98.62th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.430050000000; percentile 0.986200000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
10Underlying assertions
4Canonical products
10Target 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

13 scope groups

microsoft · source assertedMicrosoftMicrosoft 365 Apps for EnterpriseDirect source scope
Affected: 16.0.1 to before https://aka.ms/OfficeSecurityReleases (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "16.0.1", "lessThan": "https://aka.ms/OfficeSecurityReleases", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Excel 2013 Service Pack 1Direct source scope
Affected: 15.0.0.0 to before 15.0.5397.1001 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.0.0.0", "lessThan": "15.0.5397.1001", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Excel 2016Direct source scope
Affected: 16.0.0.0 to before 16.0.5239.1001 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "16.0.0.0", "lessThan": "16.0.5239.1001", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Office 2013 Service Pack 1Direct source scope
Affected: 15.0.0 to before 15.0.5397.1001 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "15.0.0", "lessThan": "15.0.5397.1001", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Office 2016Direct source scope
Affected: 16.0.0 to before 16.0.5239.1001 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "16.0.0", "lessThan": "16.0.5239.1001", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Office 2019Direct source scope
Affected: 19.0.0 to before https://aka.ms/OfficeSecurityReleases (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "19.0.0", "lessThan": "https://aka.ms/OfficeSecurityReleases", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Office 2019 for MacDirect source scope
Affected: 16.0.0 to before 16.55.21111400 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "16.0.0", "lessThan": "16.55.21111400", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Office LTSC 2021Direct source scope
Affected: 16.0.1 to before https://aka.ms/OfficeSecurityReleases (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "16.0.1", "lessThan": "https://aka.ms/OfficeSecurityReleases", "versionType": "custom"}]
microsoft · source assertedMicrosoftMicrosoft Office LTSC for Mac 2021Direct source scope
Affected: 16.0.1 to before 16.55.21111400 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "16.0.1", "lessThan": "16.55.21111400", "versionType": "custom"}]
NVD CPE · APPLICATIONmicrosoft365_appsVulnerable target · 1 assertions
Version not applicableCanonical identity product-14a59f3c1c4fc4cec4da9e1d602ac339da114e67c884352e121c41fb03b7a712Linked exact
Scope supported
Inspect raw assertion
  1. cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    40c15edd-98d4-4d06-ba06-21ae0f33c72d
NVD CPE · APPLICATIONmicrosoftexcelVulnerable target · 2 assertions
Version 2013Canonical identity product-1583a0890c2b29ac138d93d8997cbf1b2f38a707f8b4b5b3d38e281b544e22acLinked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:microsoft:excel:2013:sp1:*:*:rt:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 2
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    3a062169-527e-43da-8ae0-fd4fba1b2a9b
  2. cpe:2.3:a:microsoft:excel:2013:sp1:*:*:-:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 1
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    bf89fec4-936e-4226-94f9-2bd0cb0ca09f
NVD CPE · APPLICATIONmicrosoftofficeVulnerable target · 5 assertions
Version 2013; Version 2016; Version 2019Canonical identity product-f4efee17050cd92d62299077c43827052b373ddcb783c02caa43c2fbb378d2f4Linked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:microsoft:office:2019:*:*:*:*:macos:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 7
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    40961b9e-80b6-42e0-a876-58b3ce056e4e
  2. cpe:2.3:a:microsoft:office:2013:sp1:*:*:-:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 3
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    552e1557-d6fa-45dd-9b52-e13acdbb8a62
  3. cpe:2.3:a:microsoft:office:2013:sp1:*:*:rt:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 4
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    f7ddffb8-2337-4dd7-8120-56cc8ef134b4
  4. cpe:2.3:a:microsoft:office:2019:*:*:*:*:-:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 6
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    c5282c83-86b8-442d-851d-b54e88e8b1f1
  5. cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 5
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    e0b3b0bc-c7c6-4687-ad72-dca29ff9ae3a
NVD CPE · APPLICATIONmicrosoftoffice_long_term_servicing_channelVulnerable target · 2 assertions
Version 2021Canonical identity product-911e466d0be7cb2953297756c47cb44a2f472c517f89b133f4ff5b03a0ab5264Linked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 8
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    6c9d7c93-e8cb-4a8a-ba15-093b03acc62f
  2. cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:macos:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 9
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    bf0e8112-5b6f-4e55-8e40-38adcf6fc654

Affected-product evidence

Accepted scope and product mapping

4 canonical links · 1 source-reported links

Mapping establishedEvidence supported

vendor-01299a5a765aea70faa05f2d06e0c26a5d498fd34553e868d89e8a43b31864db · product-14a59f3c1c4fc4cec4da9e1d602ac339da114e67c884352e121c41fb03b7a712

Source class
Nvd cpe vulnerable target
Assertions
1
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
0b12a998-548a-4883-9ebb-d2293eb1eb99
Mapping establishedEvidence supported

vendor-01299a5a765aea70faa05f2d06e0c26a5d498fd34553e868d89e8a43b31864db · product-1583a0890c2b29ac138d93d8997cbf1b2f38a707f8b4b5b3d38e281b544e22ac

Source class
Nvd cpe vulnerable target
Assertions
2
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
2f79bfbe-1596-4afd-ba4b-47d646ddac79e05a1383-3f58-4ced-86e4-fe7867797bf4
Mapping establishedEvidence supported

vendor-01299a5a765aea70faa05f2d06e0c26a5d498fd34553e868d89e8a43b31864db · product-911e466d0be7cb2953297756c47cb44a2f472c517f89b133f4ff5b03a0ab5264

Source class
Nvd cpe vulnerable target
Assertions
2
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
d4a252a6-e89e-452d-8a48-eb895cf5b904f0d8273b-91ce-4c98-81a7-70fab7e03bee
Mapping establishedEvidence supported

vendor-01299a5a765aea70faa05f2d06e0c26a5d498fd34553e868d89e8a43b31864db · product-f4efee17050cd92d62299077c43827052b373ddcb783c02caa43c2fbb378d2f4

Source class
Nvd cpe vulnerable target
Assertions
5
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
1c60743a-6878-442e-824d-441ffcf028563704ff01-416b-4617-9477-8f574aee5d3ed852d5ad-e3fd-4028-a9b7-fbe7f65a66f0e4c9e868-e518-4bcb-a052-4ee1c2886c25ef503a6e-bbb0-4dcb-8d07-7730cba7b772
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
9
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
18a2a3e0-6022-4543-a25e-eabfe16a28ad1a5745ed-fdf3-4987-967d-23a1b3db8aef2d235935-09cc-4c2e-9c24-e0762a45362b46bb8759-5c11-4231-89dc-878049db7a997ab1c360-c0ab-40c4-b3ae-d941adf59001883d07ee-c201-43f3-b2a9-294377c960a0bb582d53-9bf1-4a3e-b5b7-23354b3fbfead0c70cc2-3eb2-41e9-abee-4851b51c779ce0830ff4-4931-4a9f-bf5d-79e547a7b47e

Assessments

CVSS by origin

6.8
NVDCVSS 2.0 · role Primary · priority eligiblevalid_matchAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8
NVDCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8
secure@microsoft.comCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8
microsoftCVSS 3.1 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C

Direct CVE/CNA normalized decisions

7.8Priority eligible

microsoft

CVSS 3.1 · Primary · Original assertion · rank 1

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
Validation
Valid match
Recomputed
7.8
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.