CVE-2026-21255

HIGH
2026-02-10 [email protected]
8.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
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 8.8

Tags

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

Description

Improper access control in Windows Hyper-V allows an authorized attacker to bypass a security feature locally.

Analysis

Windows Hyper-V fails to properly enforce access controls, enabling local authenticated users to circumvent security features and gain unauthorized system access. This high-severity flaw affects Windows 10, Windows 11, Windows Server 2022, and Hyper-V implementations, allowing privileged attackers to escalate privileges across system boundaries. …

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Remediation

Within 24 hours: Inventory all Windows Hyper-V deployments and identify systems with direct user access; restrict administrative privileges to essential personnel only. Within 7 days: Implement network segmentation to isolate Hyper-V hosts from untrusted networks and implement enhanced monitoring for suspicious hypervisor activity. …

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Priority Score

44
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +44
POC: 0

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CVE-2026-21255 vulnerability details – vuln.today
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