EUVD-2026-73095
GHSA-xphv-w9hp-fx8m
Severity by source
AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Local-only access required, high pre-existing privileges mandated, and double-free exploitation is complex; full C/I/A impact is achievable only post-exploitation of a difficult heap corruption primitive.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Double free in Windows Failover Cluster allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via a double-free memory corruption bug in Windows Failover Cluster affects multiple Windows Server editions from Server 2012 through Server 2025, as well as Windows 10 versions 1607 and 1809. An authorized local attacker already holding high privileges can exploit heap corruption triggered by the double-free condition to achieve full confidentiality, integrity, and availability compromise of the affected system. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) local access to a Windows system with the Failover Cluster feature installed and running; and (2) an account with high privileges (PR:H per CVSS) on that system, such as a cluster administrator account or a compromised cluster service account. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 6.4 score with vector AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H reflects a significant barrier to exploitation: the attacker must already hold high privileges on the local system and navigate high attack complexity, making reliable exploitation non-trivial even for skilled actors. … 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 targeting the per-version build thresholds confirmed by EUVD: update Server 2012 to 6.2.9200.26349 or later, Server 2012 R2 to 6.3.9600.23397 or later, Server 2016 and Windows 10 1607 to 10.0.14393.9512 or later, Server 2019 and Windows 10 1809 to 10.0.17763.9245 or later, Server 2022 to 10.0.20348.5622 or later, and Server 2025 to 10.0.26100.33438 or later, via Windows Update, WSUS, or Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-415 – Double Free
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External POC / Exploit Code
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