EUVD-2026-73066
GHSA-xq6v-5hx9-cxrw
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
LLTD is a non-routable Layer 2 protocol, making AV:A more accurate than vendor-assigned AV:N; all other metrics are retained from the vendor vector.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Link Layer Topology Discovery Protocol allows an unauthorized attacker to execute code over a network.
AnalysisAI
Heap-based buffer overflow in the Windows Link Layer Topology Discovery Protocol (LLTD) implementation enables unauthenticated attackers to execute arbitrary code on affected Windows systems via crafted network-layer frames. The flaw (CWE-122) spans nearly the entire supported Windows ecosystem - from Windows 10 through Windows 11 and from Windows Server 2012 through Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network-adjacent access at Layer 2 - the attacker must be on the same broadcast domain or network segment as the target, as LLTD frames use EtherType 0x88D9 and are not forwarded by IP routers. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.1 score (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H) signals high severity with unauthenticated access and full CIA impact, moderated by high 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 | The primary fix is applying Microsoft's cumulative security update to reach the patched build versions listed per product line - deployable through Windows Update, WSUS, or SCCM. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, 11, and Server 2012-2025 systems and deploy the vendor-released Microsoft patch to a test environment to validate compatibility with your applications and infrastructure. …
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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
Leaving vuln.today