EUVD-2026-73278
GHSA-phf6-jqqc-c956
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
DHCP inherently accepts unauthenticated UDP packets from any client, impact is purely availability with no confidentiality or integrity effect, and no special conditions are needed.
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
Unauthenticated remote denial-of-service in the Windows DHCP Server service across a broad range of Windows Server builds (2012 through 2025) stems from a type confusion flaw (CWE-843) in packet-processing logic. A network-adjacent or remote attacker can send a malformed DHCP packet that causes the server process to access a resource using an incompatible type, crashing the DHCP service and halting IP address assignment for all dependent clients. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No authentication or credentials are required; the DHCP protocol accepts packets from any network client by design. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.5 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) accurately captures an unauthenticated, low-complexity, network-exploitable denial-of-service with no confidentiality or integrity consequence. … 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 vendor-released patches via Windows Update or WSUS as documented in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77890. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows Server 2012-2025 instances running DHCP Server roles and assess installed patch levels. …
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External POC / Exploit Code
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