EUVD-2026-73628
GHSA-mfjr-f58p-qpcx
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-reachable pre-auth DHCP parsing gives AV:N/PR:N/UI:N with full impact, but reliable heap-overflow exploitation against Windows mitigations warrants AC:H rather than the vendor's AC:L.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows DHCP Server allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in the Microsoft Windows DHCP Server role allows an unauthenticated network attacker to trigger a heap-based buffer overflow and execute arbitrary code, per CVSS with full confidentiality, integrity, and availability impact (9.8). All supported Windows Server builds from 2012 through 2025 running the DHCP Server role are affected. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The target must have the Windows DHCP Server role installed, enabled, and reachable by the attacker's packets (UDP 67/DHCPv4 or 546-547/DHCPv6); exploitation requires no authentication, no user interaction, and works against default DHCP configurations once the role is running. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (9.8) describes a worst-case remote, unauthenticated, no-interaction RCE with total impact - the classic profile of a wormable infrastructure flaw. … 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 for your Windows Server build as the primary fix, upgrading to at or above the fixed build for your OS: Windows Server 2012 10.0/6.2.9200.26349, 2012 R2 6.3.9600.23397, 2016 and Windows 10 1607 10.0.14393.9512, 2019 and Windows 10 1809 10.0.17763.9245, 2022 10.0.20348.5622, and 2025 10.0.26100.33438 (per Microsoft's MSRC Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69845). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows Server systems running the DHCP Server role across 2012, 2016, 2019, and 2025 versions and assess network exposure-prioritize systems with direct internet or untrusted network access. …
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External POC / Exploit Code
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