EUVD-2026-73351
GHSA-7jvx-24c9-g7q5
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local attacker with low privileges (PR:L) triggers heap overflow in a local service (AV:L) with no complexity or user interaction, achieving full SYSTEM-level impact on the local machine.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Biometric Service allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation via heap-based buffer overflow (CWE-122) in the Windows Biometric Service (WBioSrvc) affects Windows 10, Windows 11, and Windows Server 2016 through 2025 across a broad range of build versions. An authorized local attacker with low privileges can trigger the overflow to corrupt heap memory and achieve SYSTEM-level access, yielding full confidentiality, integrity, and availability impact on the local machine. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold an existing low-privileged local user account on the affected Windows system (CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score accurately reflects a local privilege escalation with low attack complexity: an attacker holding a standard user account on the machine can reliably escalate to SYSTEM without user interaction or additional configuration prerequisites. … 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 Microsoft security updates targeting the following minimum fixed build numbers: Windows Server 2016 / Windows 10 1607 to 10.0.14393.9512 or later; Windows Server 2019 / Windows 10 1809 to 10.0.17763.9245 or later; Windows Server 2022 to 10.0.20348.5622 or later; Windows 10 21H2 to 10.0.19044.7725 or later; Windows 10 22H2 to 10.0.19045.7725 or later; Windows 11 23H2 to 10.0.22631.7582 or later; Windows 11 24H2 to 10.0.26100.9445 or later; Windows Server 2025 to 10.0.26100.33438 or later; Windows 11 25H2 to 10.0.26200.9445 or later; Windows 11 26H1 to 10.0.28000.2954 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct an inventory of all Windows 10, Windows 11, and Windows Server 2016-2025 systems and confirm patch availability through your patch management system or WSUS. …
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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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