EUVD-2026-73340
GHSA-8ww6-98fx-g9xm
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local attack requiring low-privilege session with no user interaction; heap overflow in kernel driver yields full C/I/A impact with no scope change to other systems.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Resilient File System (ReFS) allows an authorized attacker to elevate privileges locally.
AnalysisAI
Heap-based buffer overflow in Windows Resilient File System (ReFS) allows a locally authenticated low-privilege attacker to escalate to SYSTEM-level privileges on affected Windows 11 and Windows Server 2025 builds. The CWE-122 flaw resides in the ReFS kernel driver and requires no user interaction, making it a reliable local privilege escalation primitive when combined with any initial-access vector. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a locally authenticated user session with at minimum low-privilege rights (PR:L) on a system running an affected Windows 11 or Windows Server 2025 build with the ReFS driver active. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score reflects a low-complexity, no-user-interaction local privilege escalation - a metric profile historically associated with reliable, widely-weaponized Windows LPE primitives. … 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 vendor-released cumulative updates via Windows Update or the Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 11 and Windows Server 2025 systems in your environment to establish exposure scope. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
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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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