CASCACascade Atlas

Evidence dossier

CVE-2021-27059

Microsoft Office Remote Code Execution Vulnerability

59.8–79.8Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

Microsoft Office Remote Code Execution Vulnerability

State
PUBLISHED
Published
Mar 11, 2021
Updated
Oct 21, 2025
Evidence coverage
72%
CISA KEVCatalog member

Apply updates per vendor instructions.

FIRST EPSS3.18%

2026-07-18 · v2026.06.15 · percentile 86.6%

Source stateConflict visible

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
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CISA ADP Vulnrichment

CVEderivative copy
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CVE Program Container

microsoftoriginal assertion
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Microsoft Office Remote Code Execution Vulnerability

CISA KEVoriginal assertion
observed_exploitation

Microsoft Office Remote Code Execution Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.031820000000; percentile 0.866310000000

Applicability

Cited product scope

Trace impact →
MicrosoftMicrosoft Office 2010 Service Pack 2
[{"status": "affected", "version": "13.0.0.0", "lessThan": "publication", "versionType": "custom"}]unknown
MicrosoftMicrosoft Office 2013 Service Pack 1
[{"status": "affected", "version": "15.0.0", "lessThan": "publication", "versionType": "custom"}]unknown
MicrosoftMicrosoft Office 2016
[{"status": "affected", "version": "16.0.0", "lessThan": "publication", "versionType": "custom"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:microsoft:office:2010:sp2:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:microsoft:office:2013:sp1:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:microsoft:office:2013:sp1:*:*:rt:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:microsoft:office:2016:*:*:*:*:*:*:*supported

Assessments

CVSS by origin

8.5
nvd@nist.govCVSS 2.0 · role PrimaryAV:N/AC:M/Au:S/C:C/I:C/A:C
6.5
nvd@nist.govCVSS 3.1 · role SecondaryCVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
7.6
secure@microsoft.comCVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H
7.6
microsoftCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C

Limitations and unknowns

  • 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; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • 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.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.