CVE-2026-21248

HIGH
2026-02-10 [email protected]
7.3
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 22:02 vuln.today
CVE Published
Feb 10, 2026 - 18:16 nvd
HIGH 7.3

Tags

Windows Hyper V Buffer Overflow Heap Overflow Windows Server 2025 Windows 10 1809 Windows 10 21h2 Windows 10 1607 Windows 11 24h2 Windows Server 2022 23h2 Windows 11 23h2 Windows 11 25h2 Windows Server 2016 Windows Server 2022 Windows Server 2019 Windows 10 22h2 Microsoft

Description

Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.

Analysis

Heap overflow in Windows Hyper-V enables authenticated local users to achieve arbitrary code execution with high privileges on affected Windows and Windows Server systems. An attacker with local access and user-level permissions can trigger memory corruption through user interaction to compromise system integrity and confidentiality. …

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Remediation

Within 24 hours: Inventory all Windows Hyper-V deployments and identify systems with untrusted user access; disable guest VM access for non-essential accounts. Within 7 days: Implement strict role-based access controls limiting Hyper-V administrative privileges, enable Enhanced Session Mode restrictions, and segment Hyper-V hosts from general user networks. …

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Priority Score

37
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +36
POC: 0

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CVE-2026-21248 vulnerability details – vuln.today
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