CVE-2026-21244

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 10 1809 Windows Server 2025 Windows 10 22h2 Windows Server 2022 23h2 Windows 11 25h2 Windows Server 2022 Windows Server 2016 Windows 10 1607 Windows 11 23h2 Windows Server 2019 Windows 10 21h2 Windows 11 24h2 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 (CVSS 7.3). Exploitation requires user interaction and local system access, affecting Windows 10 1809 and Windows Server 2025. …

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Remediation

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. Within 7 days: Implement network segmentation to isolate Hyper-V management interfaces; monitor privileged account activity for suspicious Hyper-V access patterns. …

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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-2026-21244 vulnerability details – vuln.today
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