EUVD-2026-73566
GHSA-7qq5-rgv2-3r69
Severity by source
AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Network vector confirmed by 'over a network' description; PR:L reflects authorized attacker; UI:R reflects victim must access the malicious exFAT share; full C/I/A reflects post-escalation kernel-level access.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
5DescriptionCVE.org
Out-of-bounds read in Windows exFAT File System allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Privilege escalation in the Windows exFAT File System driver (CWE-125, out-of-bounds read) allows an authenticated low-privilege attacker to gain elevated rights over a network connection. All major Windows client and server releases from Windows 10 1607 through Windows 11 26H1 and Windows Server 2012 through 2025 are confirmed affected per EUVD version data. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a low-privilege authenticated account on the network (PR:L per CVSS vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 8.0 (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H) reflects a network-accessible, low-complexity elevation-of-privilege with full C/I/A impact, tempered by the requirements for low-privilege authentication (PR:L) and user interaction (UI:R). … 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 corresponding to your Windows build, delivering the fixed build numbers listed above (e.g., 10.0.14393.9512 for Server 2016/Windows 10 1607, 10.0.26100.33438 for Server 2025). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, Windows 11, and Windows Server (2012-2025) systems in your environment and identify those with active exFAT file system usage, as exploitation requires both vulnerability and exFAT access. …
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Privilege Escalation
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External POC / Exploit Code
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