EUVD-2026-56629
GHSA-5w9v-6gqp-2463
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local execution with a low-privileged account is required; kernel heap overflow in ntfs.sys yields full confidentiality, integrity, and availability impact with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via heap-based buffer overflow in the Windows NTFS kernel driver (ntfs.sys) affects virtually the entire Microsoft Windows product portfolio, from legacy Server 2012 through Windows 11 25H2 and Server 2025. A locally authenticated, low-privileged attacker can trigger memory corruption in ring-0 kernel space, resulting in full SYSTEM-level privilege acquisition on the target host. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The CVSS vector AV:L/PR:L confirms that exploitation requires the attacker to have local code execution capability and at minimum a low-privileged user account on the target Windows system - this includes interactive logon sessions, RDP sessions, or execution via a previously compromised low-privilege process or service account. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score with vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H accurately reflects a high-severity local privilege escalation: low complexity, no user interaction, and a full C/I/A triad on the compromised host. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary remediation is applying Microsoft's released patches, available via Windows Update, WSUS, or Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, create an inventory of all Windows systems in your infrastructure across the affected versions (Server 2012 R2 through Server 2025, Windows 10, Windows 11) and verify your patch management system can deliver updates from Microsoft MSRC. …
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External POC / Exploit Code
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