Windows
CVE-2026-21244
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
Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.
AnalysisAI
Heap overflow in Windows Hyper-V enables authenticated local users to achieve arbitrary code execution with high privileges (CVSS 7.3). Exploitation requires user interaction and local system access, affecting Windows 10 1809 and Windows Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Local user account access to Windows Hyper-V with permission to interact with hypervisor management interfaces. … 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: Inventory all Hyper-V deployments and identify systems requiring patching; restrict administrative access to Hyper-V hosts through credential reviews and MFA enforcement. …
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External POC / Exploit Code
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