EUVD-2026-43793
GHSA-x462-6h9x-cxcg
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable DHCP service (AV:N), low-complexity parsing overflow (AC:L), authorized attacker so PR:L, no interaction (UI:N), and code execution yields full C/I/A on the host.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Windows DHCP Server allows an authorized attacker to execute code over a network.
AnalysisAI
Remote code execution in the Microsoft Windows DHCP Server role allows an authenticated network attacker (PR:L) to trigger a heap-based buffer overflow and run arbitrary code on the server. The flaw affects DHCP Server across Windows Server 2012 through Server 2025 (including Server Core installations) and carries a CVSS 8.8 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 the target Windows host to have the DHCP Server role installed and running and reachable over the network on the DHCP service, plus the CVSS PR:L authorization level - the attacker must already hold a low-privilege authorized position rather than being fully anonymous (the description explicitly says 'authorized attacker'). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals point to a genuine high-priority patch for organizations running the DHCP Server role. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has obtained a low-privilege authorized foothold on the network sends specially crafted DHCP messages to a Windows DHCP Server, overflowing a heap buffer during message parsing to overwrite heap control data and execute code in the service context. Given AV:N/AC:L, the attack is network-reachable and low-complexity, letting the attacker pivot from a modest foothold to full compromise of core network infrastructure. … |
| Remediation | Apply the Microsoft security update for CVE-2026-48564 as published in the MSRC update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-48564 (Patch available per vendor advisory); install the cumulative update matching each affected Windows Server / Windows 10 build via Windows Update or WSUS. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Windows DHCP Server instances across your environment, prioritize those serving business-critical networks, and verify patch availability from Microsoft security advisories. …
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External POC / Exploit Code
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