EUVD-2026-43867
GHSA-wq5c-w7mq-vqjv
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local authenticated foothold gives AV:L/PR:L; use-after-free race condition warrants AC:H; SYSTEM-level kernel compromise yields C:H/I:H/A:H with unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Use after free in Windows TCP/IP allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Microsoft Windows TCP/IP stack allows an authenticated attacker to elevate to SYSTEM by exploiting a use-after-free (CWE-416) memory corruption flaw. Affected builds span Windows 10 (1809, 21H2, 22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server 2019/2022/2025 including Server Core. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already possess a valid low-privileged local account or code-execution context on the target (AV:L, PR:L) - this is not a remotely reachable network bug despite involving the TCP/IP stack. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H, base 7.0) describes a local, authenticated attack of high complexity that fully compromises confidentiality, integrity, and availability of the host. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a low-privileged foothold on a Windows host - for example via a phished user account, a compromised service, or a limited RDP session - runs a local exploit that races socket/TCP-IP operations to trigger the use-after-free in tcpip.sys and reclaim the freed kernel object with attacker-controlled data. Winning the race corrupts kernel memory and grants SYSTEM privileges, enabling credential theft, driver installation, and full host takeover. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50307 as published in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50307; a vendor patch is available, so the primary remediation is to install the corresponding monthly cumulative update / KB for each affected SKU (consult the advisory for the exact patched build per Windows 10/11 or Server version, as the fixed build numbers are enumerated there rather than in this dataset). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all systems running Windows 10 (builds 1809, 21H2, 22H2), Windows 11 (builds 24H2, 25H2, 26H1), and Windows Server 2019, 2022, or 2025 (including Server Core installations). …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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