Role: Windows Hyper-V
CVE-2026-21248 — Windows Hyper-V Remote Code Execution Vulnerability
Executive Summary
Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.
Overview
7.3
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
Required
SCOPE
Unchanged
Temporal Score: 6.4
EPSS Score
0.01243
probability of exploitation in the next 30 days
0.65357 percentile - updated 2026-06-20
View on FIRST.org
Affected Products
21 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 Version 1607 for x64-based Systems | 5075999 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 1809 for x64-based Systems | 5075904 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 21H2 for x64-based Systems | 5075912 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 10 Version 22H2 for x64-based Systems | 5075912 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 11 Version 23H2 for ARM64-based Systems | 5075941 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 11 Version 23H2 for x64-based Systems | 5075941 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 11 Version 24H2 for ARM64-based Systems | 5077181 (Security Update) 5077212 (Security Hotpatch Update) |
Important | Remote Code Execution | Yes |
| Windows 11 Version 24H2 for x64-based Systems | 5077212 (Security Hotpatch Update) 5077181 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 11 Version 25H2 for ARM64-based Systems | 5077181 (Security Update) 5077212 (Security Hotpatch Update) |
Important | Remote Code Execution | Yes |
| Windows 11 Version 25H2 for x64-based Systems | 5077181 (Security Update) 5077212 (Security Hotpatch Update) |
Important | Remote Code Execution | Yes |
| Windows 11 Version 26H1 for ARM64-based Systems | 5077179 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows 11 version 26H1 for x64-based Systems | 5077179 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2016 | 5075999 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2016 (Server Core installation) | 5075999 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2019 | 5075904 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2019 (Server Core installation) | 5075904 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2022 | 5075906 (Security Update) 5075943 (Security Hotpatch Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2022 (Server Core installation) | 5075906 (Security Update) 5075943 (Security Hotpatch Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2022, 23H2 Edition (Server Core installation) | 5075897 (Security Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2025 | 5075899 (Security Update) 5075942 (Security Hotpatch Update) |
Important | Remote Code Execution | Yes |
| Windows Server 2025 (Server Core installation) | 5075899 (Security Update) 5075942 (Security Hotpatch Update) |
Important | Remote Code Execution | Yes |
Patches
10 patches
| Article | Type | Restart |
|---|---|---|
5075999 |
Security Update | Yes |
5075904 |
Security Update | Yes |
5075912 |
Security Update | Yes |
5075941 |
Security Update | Yes |
5077181 (Security Update) 5077212 |
Security Update | Yes |
5077212 (Security Hotpatch Update) 5077181 |
Security Hotpatch Update | Yes |
5077179 |
Security Update | Yes |
5075906 (Security Update) 5075943 |
Security Update | Yes |
5075897 |
Security Update | Yes |
5075899 (Security Update) 5075942 |
Security Update | Yes |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
cyanbamboo and b2ahex
References
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