EUVD-2026-73145
GHSA-cq44-5v37-c39f
Severity by source
AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Local access with low privileges inside a guest VM required; scope changes to host hypervisor yielding full C/I/A impact on host.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.
AnalysisAI
Heap-based buffer overflow in Windows Hyper-V enables a low-privileged guest VM user to escape the hypervisor sandbox and execute arbitrary code on the host system. The CVSS scope-change metric (S:C) and C:H/I:H/A:H impact ratings confirm this is a full VM-escape class vulnerability, giving an attacker inside a guest complete control over the underlying Hyper-V host. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must have low-privileged code execution inside a Windows Hyper-V guest virtual machine (PR:L per CVSS vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a high-priority vulnerability in enterprise and cloud environments. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply Microsoft's cumulative update immediately via Windows Update or WSUS/MECM. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all systems running affected Windows versions (10 1607 through 25H2, Server 2012 through Server 2025) with Hyper-V enabled and document guest VM access patterns. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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