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Vulnerability Assessment

Weakness
CWE
CWE-125
ASVS 5.0
V15 - Secure Coding and Architecture Bounds checking, read limits
MITRE ATT&CK

1 technique across 1 tactic: Collection

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 14, 2026

Local privilege escalation in the Windows NTFS file-system driver lets an already-authenticated low-privileged user read memory outside allocated bounds (CWE-125) to gain elevated privileges. It affects a broad Windows fleet spanning Windows 10 (1607 through 22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server 2012 through 2025. Reported by Microsoft with a patch available; no public exploit identified at time of analysis and it is not listed in CISA KEV.

Affected VersionsENISA

Windows Server 2012 (Server Core installation) 6.2.9200.0 <6.2.9200.26226
Windows 10 Version 21H2 10.0.19044.0 <10.0.19044.7548
Windows Server 2022 10.0.20348.0 <10.0.20348.5386
Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 <6.3.9600.23291
Windows Server 2019 10.0.17763.0 <10.0.17763.9020
Windows 10 Version 22H2 10.0.19045.0 <10.0.19045.7548
Windows 11 Version 25H2 10.0.26200.0 <10.0.26200.8875
Windows Server 2019 (Server Core installation) 10.0.17763.0 <10.0.17763.9020
Windows 11 version 26H1 10.0.28000.0 <10.0.28000.2525
Windows Server 2025 10.0.26100.0 <10.0.26100.33158
Windows Server 2025 (Server Core installation) 10.0.26100.0 <10.0.26100.33158
Windows 11 Version 24H2 10.0.26100.0 <10.0.26100.8875
Windows Server 2016 10.0.14393.0 <10.0.14393.9339
Windows 10 Version 1607 10.0.14393.0 <10.0.14393.9339
Windows Server 2016 (Server Core installation) 10.0.14393.0 <10.0.14393.9339
Windows 10 Version 1809 10.0.17763.0 <10.0.17763.9020
Windows Server 2012 6.2.9200.0 <6.2.9200.26226
Windows Server 2012 R2 6.3.9600.0 <6.3.9600.23291

Affected Packages

euvd windows_10_version_1607 fix: 10.0.14393.9339
euvd windows_10_version_1809 fix: 10.0.17763.9020
euvd windows_10_version_21h2 fix: 10.0.19044.7548
euvd windows_10_version_22h2 fix: 10.0.19045.7548
euvd windows_11_version_24h2 fix: 10.0.26100.8875
euvd windows_11_version_25h2 fix: 10.0.26200.8875
euvd windows_11_version_26h1 fix: 10.0.28000.2525
euvd windows_server_2012 fix: 6.2.9200.26226
euvd windows_server_2012_r2 fix: 6.3.9600.23291
euvd windows_server_2012_r2_server_core_installation fix: 6.3.9600.23291
euvd windows_server_2012_server_core_installation fix: 6.2.9200.26226
euvd windows_server_2016 fix: 10.0.14393.9339
euvd windows_server_2016_server_core_installation fix: 10.0.14393.9339
euvd windows_server_2019 fix: 10.0.17763.9020
euvd windows_server_2019_server_core_installation fix: 10.0.17763.9020
euvd windows_server_2022 fix: 10.0.20348.5386
euvd windows_server_2025 fix: 10.0.26100.33158
euvd windows_server_2025_server_core_installation fix: 10.0.26100.33158

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 18 packages in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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

Vendor (microsoft) PRIMARY 7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from Vendor (microsoft) · only source for this CVE.

CVSS VectorVendor: microsoft

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionCVE.org

Out-of-bounds read in Windows NTFS allows an authorized attacker to elevate privileges locally.

Executive ViewAI

Why It Matters

A privilege escalation vulnerability in the Windows NTFS driver (CVE-2026-50422) enables any authenticated user to gain system-level administrative access, affecting Windows 10, Windows 11, and Windows Server deployments enterprise-wide. This undermines the security boundary separating standard users from administrators and amplifies the blast radius of credential compromises. Rapid patching is essential to prevent widespread privilege escalation across the entire Windows infrastructure.

Recommended Action

Within 24 hours, conduct a complete inventory of Windows 10 (versions 1607-22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server 2012-2025 systems to establish a patch baseline and identify critical systems. Within 7 days, deploy the vendor-released patch through Windows Update, WSUS, or equivalent patch management tools, prioritizing systems with elevated privileges or running as services. Within 30 days, achieve 100% compliance across the Windows fleet through vulnerability scanning and verification reporting.

Business Impact: High
Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score
0.3%
Top 76% exploitable
Vendor Status
Publicly Disclosed:No
Exploited:No
Latest Software Release:Exploitation Less Likely
Data Quality
5 sources
Confidence: Medium
EUVD 🇯🇵JVN NVD CVE.org EPSS Vulnrichment MSRC

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 0.3%
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
Scheduled
Exploitation
None
System Exposure· derived
Small
Automatable
No
Human Impact
High
Technical Impact
Total

Priority Score

39
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +39
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

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Same weakness CWE-125 – Out-of-bounds Read

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Same technique Buffer Overflow

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CVE-2020-0796 CRITICAL POC
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References

Advisories & patches
PATCH https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50422 ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-50422

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