EUVD-2026-44141
GHSA-r7g5-hhjw-w68r
Severity by source
AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable DHCP service (AV:N) but the double-free requires winning a heap race (AC:H) and some authorized access (PR:L); successful code execution yields full C/I/A impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Double free 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 (Windows Server 2012 through 2025, plus Windows 10 1607/1809) arises from a double-free (CWE-415) condition that an authorized, network-adjacent attacker can trigger to run arbitrary code in the DHCP service context. The CVSS 3.1 vector (AV:N/AC:H/PR:L/UI:N) indicates a network-reachable but high-complexity attack requiring low-level privileges, 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 host to have the Windows DHCP Server role installed and running, and the attacker must be able to send DHCP protocol traffic to it (UDP 67) while holding some authorized/low-level privilege as indicated by PR:L - this is not an anonymous internet-wide attack. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are moderate-to-serious but not emergency-tier. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with low-level authorized access to a network segment reachable by the DHCP service sends a carefully crafted sequence of DHCP messages designed to force the server to free the same internal buffer twice and then reclaim it with attacker-controlled data. By winning the resulting heap race (reflecting the AC:H complexity), the attacker corrupts allocator state to gain code execution in the DHCP Server process. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50685 to all systems running the DHCP Server role; the fix is delivered through the standard monthly cumulative update, and the exact build/KB should be taken from the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50685 (Vendor-released patch: available per Microsoft advisory - confirm the KB for your specific OS build there). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Windows DHCP servers across the environment and obtain Microsoft's vendor patch. …
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Same weakness CWE-415 – Double Free
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External POC / Exploit Code
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