EUVD-2026-73770
GHSA-7xj8-4h9x-9r2x
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local low-privileged access sufficient to trigger heap overflow in WinBio service; no UI needed; full C/I/A upon successful SYSTEM escalation.
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 in the Windows Biometric Service (WinBio) affects a broad range of Windows 10, Windows 11, and Windows Server releases from 2016 through 2025. An authorized low-privileged local user can exploit the memory corruption flaw to achieve full SYSTEM-level code execution with high confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid low-privileged local user account on the target Windows system (CVSS PR:L, AV:L) - the attacker must be able to log in interactively or execute code locally. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately reflects the threat model: a local low-privileged attacker with no required user interaction or elevated prerequisites can trigger the overflow reliably given low attack complexity. … 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 security updates that advance each affected build to its fixed version: Windows 10 1607 and Server 2016 to build 10.0.14393.9512; Windows 10 1809 and Server 2019 to 10.0.17763.9245; Windows 10 21H2 to 10.0.19044.7725; Windows 10 22H2 to 10.0.19045.7725; Windows 11 23H2 to 10.0.22631.7582; Windows 11 24H2 to 10.0.26100.9445; Windows Server 2025 to 10.0.26100.33438; Windows 11 25H2 to 10.0.26200.9445; Windows 11 26H1 to 10.0.28000.2954; Windows Server 2022 to 10.0.20348.5622. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, deploy an inventory scan to all Windows 10, Windows 11, and Windows Server 2016-2025 systems using your endpoint management platform to establish affected asset count and criticality ranking. …
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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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