CASCACascade Atlas

Evidence dossier

CVE-2020-1040

CVE-2020-1040

64.5–82.8Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

A remote code execution vulnerability exists when Hyper-V RemoteFX vGPU on a host server fails to properly validate input from an authenticated user on a guest operating system, aka 'Hyper-V RemoteFX vGPU Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2020-1032, CVE-2020-1036, CVE-2020-1041, CVE-2020-1042, CVE-2020-1043.

State
PUBLISHED
Published
Jul 14, 2020
Updated
Oct 21, 2025
Evidence coverage
72%
CISA KEVCatalog member

Apply updates per vendor instructions.

FIRST EPSS6.90%

2026-07-18 · v2026.06.15 · percentile 93.4%

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
container

CVE Program Container

microsoftoriginal assertion
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A remote code execution vulnerability exists when Hyper-V RemoteFX vGPU on a host server fails to properly validate input from an authenticated user on a guest operating system, aka 'Hyper-V RemoteFX vGPU Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2020-1032, CVE-2020-1036, CVE-2020-1041, CVE-2020-1042, CVE-2020-1043.

CISA KEVoriginal assertion
observed_exploitation

Microsoft Hyper-V RemoteFX vGPU Remote Code Execution Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.069030000000; percentile 0.933530000000

Applicability

Cited product scope

Trace impact →
MicrosoftWindows Server
[{"status": "affected", "version": "2016"}, {"status": "affected", "version": "2016 (Core installation)"}, {"status": "affected", "version": "2008 R2 for x64-based Systems Service Pack 1"}, {"status": "affected", "version": "2008 R2 for x64-based Systems Service Pack 1 (Core installation)"}, {"status": "affected", "version": "2012"}, {"status": "affected", "version": "2012 (Core installation)"}, {"status": "affected", "version": "2012 R2"}, {"status": "affected", "version": "2012 R2 (Core installation)"}]unknown
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2008:r2:*:*:*:*:*:x64:*supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*supported

Assessments

CVSS by origin

9.0
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
7.7
nvd@nist.govCVSS 2.0 · role PrimaryAV:A/AC:L/Au:S/C:C/I:C/A:C
9.0
134c704f-9b21-4f2e-91b3-4a467353bcc0CVSS 3.1 · role SecondaryCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
9.0
CISA-ADPCVSS 3.1 · role unknownCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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.