EUVD-2026-73679
GHSA-fgxc-mx7j-4qp6
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local low-privileged access sufficient; no interaction needed; full SYSTEM-level impact on the local machine upon successful heap exploitation.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Network Connection Broker allows an authorized attacker to elevate privileges locally.
AnalysisAI
Heap-based buffer overflow in the Windows Network Connection Broker service enables a locally authenticated, low-privileged attacker to escalate privileges to SYSTEM on affected Windows endpoints and servers. The vulnerability spans an exceptionally wide range of Microsoft platforms - from Windows Server 2012 through Windows Server 2025 and Windows 10/11 across multiple feature updates - making it a broad-surface local privilege escalation risk. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local authenticated session on the target system with at least low-privileged user rights (PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) is consistent with a classic local privilege escalation primitive: any authenticated local user can exploit this deterministically with no interaction from other users. … 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 security update corresponding to the installed Windows version via Windows Update, WSUS, or Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows Server (2012-2025) and Windows 10/11 systems across the organization and prioritize production servers for remediation. …
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Threat intelligence, references, and detailed analysis are available after sign-in.
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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