EUVD-2026-73276
GHSA-xpp7-6pc7-h3gp
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Unauthenticated network-reachable crash of DHCP service; no confidentiality or integrity impact, complete availability loss on vulnerable service.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Access of resource using incompatible type ('type confusion') in Windows DHCP Server allows an unauthorized attacker to deny service over a network.
AnalysisAI
Type confusion (CWE-843) in Windows DHCP Server enables unauthenticated remote denial of service across an extensive range of Windows Server releases, from Windows Server 2012 through Windows Server 2025. An attacker on the network can send a malformed DHCP packet that triggers incompatible type access in the DHCP service, crashing it and disrupting IP address assignment for all network clients served by that host. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The Windows DHCP Server role must be installed and actively running on the target host - this role is not enabled by default on standard Windows Server installations and must be explicitly added via Server Manager or PowerShell. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) accurately captures this threat: unauthenticated, low-complexity, fully network-accessible, with complete availability impact on the DHCP service. … 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 | The primary remediation is to apply the vendor-released security update from Microsoft's July 2026 Patch Tuesday cycle, which brings each affected build to or above its respective fixed build number: Server 2012 to 6.2.9200.26349 or later, Server 2012 R2 to 6.3.9600.23397 or later, Server 2016 and Windows 10 1607 to 10.0.14393.9512 or later, Server 2019 and Windows 10 1809 to 10.0.17763.9245 or later, Server 2022 to 10.0.20348.5622 or later, and Server 2025 to 10.0.26100.33438 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all production Windows Server DHCP instances (2012 through 2025) and assess network criticality. …
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External POC / Exploit Code
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