EUVD-2026-73099
GHSA-x8hw-qhr4-gc2v
Severity by source
AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Physical access mandatory (AV:P), no credentials needed once present (PR:N), and kernel-mode execution yields full C/I/A compromise.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Spaceport.sys allows an unauthorized attacker to execute code with a physical attack.
AnalysisAI
Heap-based buffer overflow in the Windows Storage Spaces kernel driver (Spaceport.sys) enables kernel-mode code execution through a physical attack, affecting nearly every supported Windows desktop and server release. The flaw carries a CVSS 3.1 score of 6.8 with a physical attack vector, meaning an adversary must have hands-on access to the target hardware to trigger the overflow. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Physical access to the target machine is the absolute prerequisite - this vulnerability cannot be triggered remotely or over a network. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The physical attack vector (AV:P) is the single most important risk modifier here: an attacker cannot exploit this remotely or even over a local network - physical proximity to the hardware is mandatory. … 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 the applicable Windows version as documented in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-71348; the specific fixed builds are listed per product in the affected versions section. … Detailed patch versions, workarounds, and compensating controls in full report. |
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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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