EUVD-2026-56648
GHSA-www6-x9j5-657j
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector and low-privilege requirement confirmed by description; heap overflow in a SYSTEM-privileged service yields full CIA impact with no user interaction.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows DHCP Client allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via heap-based buffer overflow in the Windows DHCP Client affects Windows 11 (versions 23H2 through 26H1) and Windows Server 2025, allowing an authorized local attacker with low-level privileges to gain full SYSTEM-level control. The flaw carries a CVSS base score of 7.8 with high confidentiality, integrity, and availability impact on the local system. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid, authorized local account with at least low-level privileges on the affected system (CVSS PR:L, AV:L) - remote unauthenticated exploitation is not possible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 High rating is well-supported by the AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H vector - low attack complexity and no user interaction mean that any attacker who has obtained a foothold on the host can reliably escalate to SYSTEM with minimal friction. … 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 | Microsoft has released patches for all affected versions and administrators should apply updates via Windows Update or WSUS immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and document all Windows 11 (versions 23H2-26H1) and Windows Server 2025 systems in your environment. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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