EUVD-2026-73915
GHSA-43fm-jfr6-895r
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local low-privileged access sufficient to trigger kernel NTFS heap overflow; no interaction needed; full system compromise yields C:H/I:H/A:H 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
Local privilege escalation in Windows NTFS (ntfs.sys) allows a low-privileged local attacker to achieve SYSTEM-level code execution via a heap-based buffer overflow (CWE-122). The vulnerability spans virtually every supported Windows release - from Windows Server 2012 R2 through Windows 11 26H1 and Windows Server 2025 - making the affected surface exceptionally broad. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a low-privileged local user account on the affected Windows system (confirmed by CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score with AV:L/AC:L/PR:L/UI:N accurately characterizes a reliable, low-friction local privilege escalation: once local code execution is established, no further preconditions are needed to exploit this flaw. … 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 | Apply the Microsoft security update for CVE-2026-83995 corresponding to the specific Windows build in use: Windows 10 21H2/22H2 → build 10.0.19044/19045.7725; Windows 11 24H2/25H2 → 10.0.26100/26200.9445; Windows 11 26H1 → 10.0.28000.2954; Windows Server 2022 → 10.0.20348.5622; Windows Server 2025 → 10.0.26100.33438; Windows Server 2019 → 10.0.17763.9245; Windows Server 2016 → 10.0.14393.9512; Windows Server 2012 R2 → 6.3.9600.23397; Windows Server 2012 → 6.2.9200.26349. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows Server and Windows desktop systems running Windows Server 2012 R2 or later (including Windows 11 and Server 2025) and confirm patch availability for CVE-2026-83995 from your vendor advisory. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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