CASCACascade Atlas

Evidence dossier

CVE-2025-21334

Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability

62.0–77.0Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability

State
PUBLISHED
Published
Jan 14, 2025
Updated
Jun 9, 2026
Evidence coverage
85%
CISA KEVCatalog member

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

FIRST EPSS1.53%

2026-07-18 · v2026.06.15 · percentile 71.9%

Source stateNo scored conflict

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

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

microsoftoriginal assertion
container

Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability

CISA KEVoriginal assertion
observed_exploitation

Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.015300000000; percentile 0.719390000000

Applicability

Cited product scope

Trace impact →
MicrosoftWindows 10 Version 21H2
[{"status": "affected", "version": "10.0.19044.0", "lessThan": "10.0.19044.5371", "versionType": "custom"}]unknown
MicrosoftWindows 10 Version 22H2
[{"status": "affected", "version": "10.0.19045.0", "lessThan": "10.0.19045.5371", "versionType": "custom"}]unknown
MicrosoftWindows 11 version 22H2
[{"status": "affected", "version": "10.0.22621.0", "lessThan": "10.0.22621.4751", "versionType": "custom"}]unknown
MicrosoftWindows 11 version 22H3
[{"status": "affected", "version": "10.0.22631.0", "lessThan": "10.0.22631.4751", "versionType": "custom"}]unknown
MicrosoftWindows 11 Version 23H2
[{"status": "affected", "version": "10.0.22631.0", "lessThan": "10.0.22631.4751", "versionType": "custom"}]unknown
MicrosoftWindows 11 Version 24H2
[{"status": "affected", "version": "10.0.26100.0", "lessThan": "10.0.26100.2894", "versionType": "custom"}]unknown
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation)
[{"status": "affected", "version": "10.0.25398.0", "lessThan": "10.0.25398.1369", "versionType": "custom"}]unknown
MicrosoftWindows Server 2025
[{"status": "affected", "version": "10.0.26100.0", "lessThan": "10.0.26100.2894", "versionType": "custom"}]unknown
MicrosoftWindows Server 2025 (Server Core installation)
[{"status": "affected", "version": "10.0.26100.0", "lessThan": "10.0.26100.2894", "versionType": "custom"}]unknown
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*; end excluding 10.0.19044.5371supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*; end excluding 10.0.19045.5371supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_11_22h2:*:*:*:*:*:*:arm64:*; end excluding 10.0.22621.4751supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_11_22h2:*:*:*:*:*:*:x64:*; end excluding 10.0.22621.4751supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*; end excluding 10.0.22631.4751supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*; end excluding 10.0.22631.4751supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*; end excluding 10.0.26100.2894supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*; end excluding 10.0.26100.2894supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*; end excluding 10.0.25398.1369supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*; end excluding 10.0.26100.2894supported

Assessments

CVSS by origin

7.8
secure@microsoft.comCVSS 3.1 · role SecondaryCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8
microsoftCVSS 3.1 · role unknownCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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.