EUVD-2026-73357
GHSA-rm8w-75f8-57wf
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local service heap overflow exploitable by any authenticated user (PR:L, AV:L); full CIA impact reflects SYSTEM-level privilege escalation on the vulnerable host.
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
Heap-based buffer overflow in the Windows Biometric Service (WBioSrvc) allows a locally authenticated low-privileged attacker to escalate privileges to SYSTEM level on affected endpoints and servers. The flaw (CWE-122) spans 15 distinct Windows builds from Windows 10 1607 through Windows Server 2025, making it broadly applicable across most enterprise Windows fleets. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local user account (PR:L per CVSS vector) - no network-facing exposure exists (AV:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score with AV:L/AC:L/PR:L/UI:N accurately characterizes a local privilege escalation with no special complexity - once an attacker has any foothold on a machine, exploitation is straightforward. … 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's security update for all affected Windows versions. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: catalog all Windows 10 (1607 and later) and Windows Server (2016 through 2025) systems in your environment and consult Microsoft security advisories for applicable patch KB numbers. …
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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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