EUVD-2026-73575
GHSA-853f-xh5h-cpwx
Severity by source
AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Network-reachable kernel overflow via authenticated low-privilege session; UI:R reflects required storage interaction; S:U retained as escalation stays within same OS boundary.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Spaceport.sys allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Heap-based buffer overflow in Windows Spaceport.sys - the kernel-mode driver backing Microsoft Storage Spaces - permits an authenticated low-privileged network attacker to escalate privileges to SYSTEM-level on affected Windows hosts. The vulnerability spans virtually the entire modern Windows ecosystem, from Windows Server 2012 through Windows Server 2025 and Windows 10/11 across multiple feature-update channels. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires (1) network access to a Windows host exposing Storage Spaces-related interfaces (e.g., iSCSI target, SMB Direct, or Cluster Shared Volume endpoints), (2) a low-privileged authenticated session on that network - PR:L confirms anonymous exploitation is not possible, and (3) some user or system interaction (UI:R) that traverses the vulnerable Spaceport.sys code path, such as mounting or accessing a remote storage resource. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.0 (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H) accurately reflects high real-world risk: network reachability (AV:N) combined with low-privilege authentication and a kernel heap overflow producing full CIA impact is a serious combination for any Windows Server environment using networked storage. … 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-released patches distributed via Windows Update and WSUS. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit which Windows systems and servers in your environment use Storage Spaces and identify those running unpatched builds. …
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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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