Windows
CVE-2026-21247
HIGH
Severity by source
AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally.
AnalysisAI
Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally. [CVSS 7.3 HIGH]
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires local system access with low-privilege user account and user interaction (UI:R). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.3 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker could exploit this vulnerability to compromise the affected system. |
| Remediation | Monitor vendor advisories for a patch. Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify and inventory all systems running Hyper-V, assess exposure in production environments, and establish incident response readiness. …
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