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CVE-2026-21244

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CVE-2026-21244

Published: Feb 10, 2026

Modified: May 11, 2026

PUBLISHED

CVSS v3.1

7.3

HIGH

Description

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

VendorProductVersions

Microsoft

Windows 10 Version 1607

affected
10.0.14393.0 - < 10.0.14393.8868

Microsoft

Windows 10 Version 1809

affected
10.0.17763.0 - < 10.0.17763.8389

Microsoft

Windows 10 Version 21H2

affected
10.0.19044.0 - < 10.0.19044.6937

Microsoft

Windows 10 Version 22H2

affected
10.0.19045.0 - < 10.0.19045.6937

Microsoft

Windows 11 version 22H3

affected
10.0.22631.0 - < 10.0.22631.6649

Microsoft

Windows 11 Version 23H2

affected
10.0.22631.0 - < 10.0.22631.6649

Microsoft

Windows 11 Version 24H2

affected
10.0.26100.0 - < 10.0.26100.7840

Microsoft

Windows 11 Version 25H2

affected
10.0.26200.0 - < 10.0.26200.7840

Microsoft

Windows 11 version 26H1

affected
10.0.28000.0 - < 10.0.28000.1575

Microsoft

Windows 11 Version 26H1

affected
10.0.28000.0 - < 10.0.28000.1575

Microsoft

Windows Server 2016

affected
10.0.14393.0 - < 10.0.14393.8868

Microsoft

Windows Server 2016 (Server Core installation)

affected
10.0.14393.0 - < 10.0.14393.8868

Microsoft

Windows Server 2019

affected
10.0.17763.0 - < 10.0.17763.8389

Microsoft

Windows Server 2019 (Server Core installation)

affected
10.0.17763.0 - < 10.0.17763.8389

Microsoft

Windows Server 2022

affected
10.0.20348.0 - < 10.0.20348.4773

Microsoft

Windows Server 2022, 23H2 Edition (Server Core installation)

affected
10.0.25398.0 - < 10.0.25398.2149

Microsoft

Windows Server 2025

affected
10.0.26100.0 - < 10.0.26100.32370

Microsoft

Windows Server 2025 (Server Core installation)

affected
10.0.26100.0 - < 10.0.26100.32370

Weaknesses (CWE)

CWE-122

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

References

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