EUVD-2026-44142
GHSA-4fp6-vmpf-q92c
Severity by source
AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Adjacent-network vector (AV:A) and low existing privileges (PR:L) match a DHCP-role EoP; low complexity and no UI, with full host compromise giving C/I/A:H.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Windows DHCP Server allows an authorized attacker to elevate privileges over an adjacent network.
AnalysisAI
Privilege escalation in Microsoft Windows DHCP Server (across Windows Server 2012 through 2025 and Windows 10 1607/1809) allows an authenticated attacker on an adjacent network to elevate privileges by triggering a heap-based buffer overflow (CWE-122). Exploitation yields full confidentiality, integrity, and availability impact (C:H/I:H/A:H) on the affected server, effectively giving the attacker high-privilege control of the DHCP service host. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target to be running the Windows DHCP Server role (only DHCP servers are affected, not DHCP clients), and the attacker must have a presence on an adjacent network - the same layer-2 broadcast/link-local segment as the server (AV:A), not routed internet access. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 8.0 (High) with vector AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has compromised a low-privileged host on the same network segment as a Windows DHCP server (for example a foothold workstation on a flat office VLAN) crafts and sends a malformed DHCP message that overflows a heap buffer in the DHCP service. The corruption is leveraged to execute code or manipulate state in the privileged service context, elevating the attacker's privileges on the DHCP host and enabling lateral movement. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50683 (Patch available per vendor advisory) via the MSRC update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50683; consult that page for the exact KB/build numbers matching each affected Windows Server and Windows 10 release, as specific fixed build numbers are not enumerated in the provided data and should not be invented. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all DHCP servers running affected Windows versions and document network segmentation and criticality level. …
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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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