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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Local user logs into Windows system
  2. Exploit
    Crafts malicious input for Hyper-V component
  3. Execution
    Triggers improper input validation flaw
  4. Impact
    Executes arbitrary code with elevated privileges

Vulnerability Assessment

Weakness
CWE
CWE-20
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V2 - Validation and Business Logic Input validation, allowlisting
Exploitation Conditions

Requires local system access with low-privilege user account and user interaction (UI:R). Target must have Windows Hyper-V installed and enabled. Attacker needs ability to interact with Hyper-V management interface or pass crafted input through Hyper-V-exposed functionality.
Impact

CVSS 7.3 (HIGH). Attack vector: Local. Complexity: Low. Privileges required: Low. User interaction: Required. Exploitable via local access.
Exploit ScenarioDerived

An attacker could exploit this vulnerability to compromise the affected system.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally. [CVSS 7.3 HIGH]

RemediationAI

Monitor vendor advisories for a patch.

Affected Packages

microsoft windows_10_version_1607_10_0_14393_8868 fix: Windows 10 Version 1607 for x64-based Systems 10.0.14393.8868
microsoft windows_10_version_1809_10_0_17763_8389 fix: Windows 10 Version 1809 for x64-based Systems 10.0.17763.8389
microsoft windows_10_version_21h2_10_0_19044_6937 fix: Windows 10 Version 21H2 for x64-based Systems 10.0.19044.6937
microsoft windows_10_version_22h2_10_0_19045_6937 fix: Windows 10 Version 22H2 for x64-based Systems 10.0.19045.6937
microsoft windows_11_version_23h2_10_0_22631_6649 fix: Windows 11 Version 23H2 for ARM64-based Systems 10.0.22631.6649, Windows 11 Version 23H2 for x64-based Systems 10.0.22631.6649
microsoft windows_11_version_24h2_10_0_26100_7840 fix: Windows 11 Version 24H2 for ARM64-based Systems 10.0.26100.7840, Windows 11 Version 24H2 for x64-based Systems 10.0.26100.7840
microsoft windows_11_version_25h2_10_0_26200_7840 fix: Windows 11 Version 25H2 for ARM64-based Systems 10.0.26200.7840, Windows 11 Version 25H2 for x64-based Systems 10.0.26200.7840
microsoft windows_11_version_26h1_10_0_28000_1575 fix: Windows 11 Version 26H1 for ARM64-based Systems 10.0.28000.1575, Windows 11 version 26H1 for x64-based Systems 10.0.28000.1575
microsoft windows_server_2016_10_0_14393_8868 fix: Windows Server 2016 10.0.14393.8868, Windows Server 2016 (Server Core installation) 10.0.14393.8868
microsoft windows_server_2019_10_0_17763_8389 fix: Windows Server 2019 10.0.17763.8389, Windows Server 2019 (Server Core installation) 10.0.17763.8389
microsoft windows_server_2022_10_0_20348_4773 fix: Windows Server 2022 10.0.20348.4773, Windows Server 2022 (Server Core installation) 10.0.20348.4773
microsoft windows_server_2022_23h2_edition_10_0_25398_2149 fix: Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2149
microsoft windows_server_2025_10_0_26100_32370 fix: Windows Server 2025 10.0.26100.32370, Windows Server 2025 (Server Core installation) 10.0.26100.32370

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 13 packages in microsoft

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Technical ContextAI · show details

Classified as CWE-20 (Improper Input Validation). Affects Windows 10 1607. Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 7.3 HIGH
AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionCVE.org

Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally.

Executive ViewAI

Why It Matters

A high-severity vulnerability in Windows Hyper-V allows authorized users with local access to execute arbitrary code, potentially compromising virtual infrastructure and hosted workloads. Organizations relying on Hyper-V for critical operations face elevated risk until mitigation measures are implemented, particularly in multi-tenant or shared compute environments.

Business Impact: High
Compensating Controls

Restrict administrative access to Hyper-V hosts through network segmentation and firewall rules; enforce multi-factor authentication for privileged accounts; implement host-based monitoring and logging to detect suspicious process execution; disable unnecessary Hyper-V features and management interfaces; isolate critical Hyper-V infrastructure on dedicated networks; conduct regular access reviews to minimize authorized users with local system access; consider temporary migration of sensitive workloads to patched alternative infrastructure if available.

Threat Intelligence Overview

EPSS Score
0.0%
Top 88% exploitable
Data Quality
3 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact
High

Priority Score

36
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +36
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Affected Products (CPE)CVE.org

cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

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References

Advisories & patches
ADVISORY https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21247

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