CASCACascade Atlas

Evidence dossier

CVE-2021-42237

Sitecore XP 7.5 Initial Release to Sitecore XP 8.2 Update-7 is vulnerable to an insecure deserialization attack where it is possible to achieve remote command execution on the…

Exploited in the wild (CISA KEV since Mar 25, 2022). NVD reports CVSS 3.1 9.8. EPSS estimates 97.9% exploit likelihood as of Aug 26, 2026.

86.9–88.5Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

Sitecore XP 7.5 Initial Release to Sitecore XP 8.2 Update-7 is vulnerable to an insecure deserialization attack where it is possible to achieve remote command execution on the machine. No authentication or special configuration is required to exploit this vulnerability.

State
PUBLISHED
Published
Nov 5, 2021
Updated
Jul 9, 2026
Evidence coverage
99%

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
    mitre

    Record text: Sitecore XP 7.5 Initial Release to Sitecore XP 8.2 Update-7 is vulnerable to an insecure deserialization attack where it is possible to achieve remote command execution on the machine. No authentication or special configuration is required to exploit this vulnerability.

    Inspect raw assertion
    Field
    container
    Value
    Sitecore XP 7.5 Initial Release to Sitecore XP 8.2 Update-7 is vulnerable to an insecure deserialization attack where it is possible to achieve remote command execution on the machine. No authentication or special configuration is required to exploit this vulnerability.
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: Sitecore XP Remote Command Execution Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Sitecore XP Remote Command Execution Vulnerability
    Original evidence ↗
  5. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 97.9% probability · 99.9th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.979040000000; percentile 0.999040000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date Mar 25, 2022 · first observed Jul 19, 2026

Exploit likelihood97.90%

FIRST EPSS · score date Aug 26, 2026 · 99.9th percentile · first observed Aug 26, 2026

SeverityCVSS 9.8

NVD · 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 ↗
mitreOriginal assertion
Record text

Sitecore XP 7.5 Initial Release to Sitecore XP 8.2 Update-7 is vulnerable to an insecure deserialization attack where it is possible to achieve remote command execution on the machine. No authentication or special configuration is required to exploit this vulnerability.

Inspect raw assertion
Field
container
Value
Sitecore XP 7.5 Initial Release to Sitecore XP 8.2 Update-7 is vulnerable to an insecure deserialization attack where it is possible to achieve remote command execution on the machine. No authentication or special configuration is required to exploit this vulnerability.
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CISA KEVOriginal assertion
Exploitation cataloged

Sitecore XP Remote Command Execution Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
Sitecore XP Remote Command Execution Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

97.9% probability · 99.9th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.979040000000; percentile 0.999040000000
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

2 scope groups

mitre · source assertedn/an/aDirect source scope
Affected: n/a
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "n/a"}]
NVD CPE · APPLICATIONsitecoreexperience_platformVulnerable target · 24 assertions
Version 7.5; Version 8.0; Version 8.1; Version 8.2Canonical identity product-5723f393280ecafaf970bd18bfea026a6af546b72af1caf29873b558a234c74cLinked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:sitecore:experience_platform:8.1:update3:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 15
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    b2b4b37e-265b-40bb-add9-856f751322c6
  2. cpe:2.3:a:sitecore:experience_platform:8.2:update4:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 20
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    2f73bf18-6d89-4663-aa37-56fc976a0ee8
  3. cpe:2.3:a:sitecore:experience_platform:8.2:update2:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 18
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    6c754113-6d8e-4b0d-872c-266088b27362
  4. cpe:2.3:a:sitecore:experience_platform:8.0:update2:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 6
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    b59b52c9-788f-4f31-9426-001aefaeb8f0
  5. cpe:2.3:a:sitecore:experience_platform:8.1:-:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 12
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    c9362ed8-9012-4771-bed2-501921784e5f
  6. cpe:2.3:a:sitecore:experience_platform:8.0:update6:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 10
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    fb53f79e-fa06-423c-b9bc-96af052726b9
  7. cpe:2.3:a:sitecore:experience_platform:7.5:update1:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 1
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    adc6c446-a985-465a-9fbe-5fcee9c6cbd6
  8. cpe:2.3:a:sitecore:experience_platform:8.0:update3:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 7
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    e4d47317-4e1f-4c2e-bd56-960bfd6947bd
  9. cpe:2.3:a:sitecore:experience_platform:8.2:update7:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 23
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    402bc64f-a66e-426b-acb9-f65ab857006b
  10. cpe:2.3:a:sitecore:experience_platform:8.0:update7:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 11
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    08dd78dd-3686-48c9-a896-cf1cfdd2fcbc
  11. cpe:2.3:a:sitecore:experience_platform:8.0:sp1:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 4
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    f6454c19-10b4-48c3-a263-9334e594164b
  12. cpe:2.3:a:sitecore:experience_platform:8.2:-:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 16
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    65e69221-68ee-4d8f-829b-12c96c197c0c
  13. cpe:2.3:a:sitecore:experience_platform:8.0:-:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 3
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    be208fb9-a66e-4073-ad2f-dc56fdbde127
  14. cpe:2.3:a:sitecore:experience_platform:7.5:-:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    7da5cb16-f850-41cc-9629-22a27a7d116b
  15. cpe:2.3:a:sitecore:experience_platform:7.5:update2:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 2
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    db23f608-4b01-4d54-8a1e-e15bee609fa2
  16. cpe:2.3:a:sitecore:experience_platform:8.0:update4:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 8
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    d36c9ab3-b22f-4c47-b92d-03d95e3c8137
  17. cpe:2.3:a:sitecore:experience_platform:8.2:update6:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 22
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    496f293c-f7ed-411a-8498-9b93fdc350c1
  18. cpe:2.3:a:sitecore:experience_platform:8.1:update2:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 14
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    17e8cd1f-2d60-4e4a-baa4-80165910058b
  19. cpe:2.3:a:sitecore:experience_platform:8.1:update1:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 13
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    47cb90d7-cc2c-4a5c-99dc-5c52a4a3e188
  20. cpe:2.3:a:sitecore:experience_platform:8.2:update3:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 19
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    aa0a84e9-0b8d-4755-af70-59207cedcc08
  21. cpe:2.3:a:sitecore:experience_platform:8.0:update1:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 5
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    e192728c-7ed3-4a49-953e-e123160965f6
  22. cpe:2.3:a:sitecore:experience_platform:8.2:update1:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 17
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    218e38e2-fbf3-4e75-8507-5bd425fa4f81
  23. cpe:2.3:a:sitecore:experience_platform:8.2:update5:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 21
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    d7cdcfb0-9c38-46ca-a2c3-6a18f4b9a224
  24. cpe:2.3:a:sitecore:experience_platform:8.0:update5:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 9
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    f2dc3a72-1bae-44c6-877a-8ac4398425a8

Affected-product evidence

Accepted scope and product mapping

1 canonical links · 1 source-reported links

Mapping establishedEvidence supported

vendor-33686ac288a5d9caea1db96b2c4534bc24e2fa56a10815c31a140c5aa4f1e806 · product-5723f393280ecafaf970bd18bfea026a6af546b72af1caf29873b558a234c74c

Source class
Nvd cpe vulnerable target
Assertions
24
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
0c3b35ca-32cf-471c-89ec-cc28dd44c7e80c51ac7a-fb28-4a90-acde-39cc9f4b56e721d2085b-59b8-4d8b-b8fe-f5a249e3b370291410b2-725d-4409-b1f8-af8700746eaf2bcd29f2-c0a2-428a-9424-4721ac94a1062c7b7d24-b83a-426c-916a-ada480e8906f33442082-7033-425b-bd43-bbaaf1a4454644beef12-33cc-4ff8-814a-1afa1188d0ad45ce76ba-6dd9-4741-ba99-738a680852b8587034fd-54ab-4a81-b1c6-b7fa9c22553759d9f47e-c4b7-40c1-8407-5119b110d119645b35b7-67b9-4065-9269-98f3c83edebd6bfc771b-19c8-4719-8e74-764ad40990a171ea410d-a829-45fd-b199-09128ad23ba67ac151de-0d02-439e-aba1-9f8e297bc12c7aeb59f3-1712-4628-9e60-b5518305ad927c4df5b9-62b9-4128-b68c-44a33fca245f81ad6f2f-e617-4944-a129-d50fc84bdb12a05d3307-b7af-42b3-b0ca-344dd5850533b0ed00f7-8a3a-4488-ade7-a7cc51214ac5b39a9720-eecb-4e71-9919-003a23ecdaddb7ff617a-0c51-4a5c-9e7a-6dc8320647a1e794f892-927d-4cf9-ae89-b6b8698530a7ec383603-b8b3-40e4-9d45-6681a2415087
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
1
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
27a70a56-d08c-4be5-a598-c9ac222139fd

Assessments

CVSS by origin

9.8
NVDCVSS 3.1 · role Primary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0
NVDCVSS 2.0 · role Primary · priority eligiblevalid_matchAV:N/AC:L/Au:N/C:C/I:C/A:C
9.8
CVE Program sourceCVSS 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
9.8
CISA-ADPCVSS 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:H

Direct CVE/CNA normalized decisions

9.8Priority eligible

CISA-ADP

CVSS 3.1 · Secondary · Independent enrichment · rank 2

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Validation
Valid match
Recomputed
9.8
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.