EUVD-2026-56636
GHSA-54r7-32cv-3934
Severity by source
AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Adjacent-network vector matches DHCP protocol scope; no privileges or interaction required per the nature of DHCP; confidentiality-only impact reflects an out-of-bounds read with no write or availability consequence.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Integer underflow (wrap or wraparound) in Windows DHCP Server allows an unauthorized attacker to disclose information over an adjacent network.
AnalysisAI
Information disclosure in the Windows DHCP Server service allows unauthenticated attackers on adjacent network segments to read out-of-bounds server memory via a malformed DHCP request that triggers an integer underflow. Affected builds span Windows Server 2012 through Windows Server 2025, as well as Windows 10 versions 1607 and 1809, making the version footprint unusually wide for a single service-role flaw. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must be on an adjacent network - the same broadcast domain, VLAN, or directly routed subnet - as a Windows system with the DHCP Server role actively installed and running. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 6.5 (Medium) reflects a meaningful but bounded threat: adjacent-network, no-authentication, no-interaction required, with high confidentiality impact and no integrity or availability 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 Microsoft's security updates for each affected platform to reach the fixed build thresholds: Windows Server 2012 to 6.2.9200.26279 or later, Windows Server 2012 R2 to 6.3.9600.23337 or later, Windows Server 2016 to 10.0.14393.9418 or later, Windows Server 2019 to 10.0.17763.9115 or later, Windows Server 2022 to 10.0.20348.5499 or later, and Windows Server 2025 to 10.0.26100.33296 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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