EUVD-2026-73403
GHSA-2622-hwfw-h976
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
USB Mass Storage Class Driver is triggered by attaching a device, so realistic vector is physical (AV:P) not network; no auth or interaction needed and kernel RCE yields full C/I/A impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows USB Mass Storage Class Driver allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in the Windows USB Mass Storage Class Driver (usbstor/UASP stack) stems from a heap-based buffer overflow reachable when the driver parses attacker-influenced storage descriptors. Microsoft rates it CVSS 9.8 with a network attack vector, meaning an unauthorized attacker could execute arbitrary code, though the affected component is a USB device-class driver, which typically implies physical or proximate device presentation rather than pure remote access. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target to process an attacker-controlled USB mass-storage device through the Windows USB Mass Storage Class Driver - i.e., a malicious or emulated USB storage device must be attached or presented (physically, via BadUSB emulation, or through USB-over-IP/VDI redirection); the malformed device descriptor then triggers the heap overflow during enumeration. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The published CVSS:3.1 vector (AV:N/AC:L/PR:N/UI:N, C:H/I:H/A:H = 9.8) presents this as a trivially remote, unauthenticated, no-interaction RCE, which would make it a top-tier priority. … 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-2026-68839 for your specific Windows build; Patch available per vendor advisory, with per-edition fixed builds listed by EUVD (e.g., update Windows Server 2025 to 10.0.26100.33438 or later, Windows 11 24H2/25H2 to 10.0.26100.9445/10.0.26200.9445, Windows Server 2022 to 10.0.20348.5622, Windows 10 22H2 to 10.0.19045.7725, and Server 2016/Windows 10 1607 to 10.0.14393.9512). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, catalog all Windows client and server systems in your environment to scope total exposure; establish patch testing procedures on non-production assets. …
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Same weakness CWE-20 – Improper Input Validation
View allSame technique Buffer Overflow
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External POC / Exploit Code
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