EUVD-2026-43878
GHSA-64v7-94jq-w86r
Severity by source
AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
DHCP is link-local so AV:A; an unauthenticated crafted packet needs no privileges or interaction (PR:N/UI:N/AC:L); heap RCE in a SYSTEM service gives full C:H/I:H/A:H.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Windows DHCP Server allows an unauthorized attacker to execute code over an adjacent network.
AnalysisAI
Remote code execution in the Microsoft Windows DHCP Server role allows an unauthenticated, adjacent-network attacker to run arbitrary code by triggering a heap-based buffer overflow (CWE-122) in DHCP message parsing. Affected systems span Windows Server 2012 through Windows Server 2025 (including Server Core installations) plus the DHCP service on Windows 10 versions 1607 and 1809, with full confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target host has the Windows DHCP Server role installed and running, and that the attacker can send DHCP traffic to it from the same adjacent/local network segment (CVSS AV:A) - a remote off-link attacker cannot reach the vulnerable code path across routed boundaries without a relay or link-local foothold. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are largely consistent and point to a genuine priority for organizations running the Windows DHCP Server role, tempered by the attack vector. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has gained a foothold on a device in the same broadcast domain as a Windows DHCP server (for example a compromised workstation or a rogue device on an office VLAN) sends a specially crafted DHCP message that overflows a heap buffer in the server's parser. Given low attack complexity, no authentication, and no user interaction, successful exploitation yields SYSTEM-level code execution on core network infrastructure. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50370 to every affected Windows Server and Windows 10 host running the DHCP Server role, using the per-product fixed builds listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50370 (exact fix versions are not reproduced in the input data, so confirm the KB and build for your specific OS from that page before deploying). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows Server 2012 through 2025 instances and Windows 10 versions 1607 and 1809 with the DHCP server role enabled, prioritizing production infrastructure and internet-connected systems. …
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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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