EUVD-2026-44061
GHSA-q9r6-xfw7-37mj
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Network-reachable DoS via authenticated low-privilege access; no confidentiality or integrity impact, only kernel availability loss.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
Lifecycle Timeline
4DescriptionNVD
Use after free in Windows Virtual Filtering Platform (VFP) allows an authorized attacker to deny service over a network.
AnalysisAI
Use-after-free in the Windows Virtual Filtering Platform (VFP) enables authenticated network attackers to crash affected Windows endpoints and servers, resulting in a denial-of-service condition. The vulnerability spans a broad range of supported Windows 10, Windows 11, and Windows Server releases through 2025, making patch prioritization important despite the medium CVSS score. No public exploit code or active exploitation has been identified at time of analysis, and SSVC classifies this as not automatable with partial technical impact.
Technical ContextAI
The Windows Virtual Filtering Platform (VFP) is a kernel-mode networking component used for packet filtering and network policy enforcement in Windows environments, including Hyper-V virtual switch scenarios. CWE-416 (Use After Free) indicates the root cause is improper memory lifecycle management: a memory region is freed but a dangling pointer to it is subsequently dereferenced, leading to undefined behavior - in this case, a kernel crash and denial of service. The CVSS vector (AV:N/AC:L/PR:L/UI:N) confirms the flaw is reachable over the network with low-privilege authentication and no user interaction, placing it in the kernel networking stack accessible to authenticated remote users. CPE data confirms the flaw exists across the microsoft:windows_10 (versions 1607, 1809, 21H2, 22H2), microsoft:windows_11 (versions 24H2, 25H2, 26H1), microsoft:windows_server_2016, and microsoft:windows_server_2019 product lines.
RemediationAI
The primary fix is to apply the Microsoft-released security update for the affected Windows build. Exact patched build thresholds per EUVD are: Windows Server 2016 and Windows 10 1607 - build 10.0.14393.9339 or later; Windows Server 2019, Windows 10 1809 - build 10.0.17763.9020 or later; Windows 10 21H2 - 10.0.19044.7548 or later; Windows 10 22H2 - 10.0.19045.7548 or later; Windows Server 2022 - 10.0.20348.5386 or later; Windows 11 24H2 and Windows Server 2025 - 10.0.26100.8875 or later (Server 2025 patch level: 10.0.26100.33158); Windows 11 25H2 - 10.0.26200.8875 or later; Windows 11 26H1 - 10.0.28000.2269 or later. Apply updates via Windows Update, WSUS, or SCCM/Intune as appropriate for the environment. Consult the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50432 for patch guidance and KB article references. If immediate patching is not feasible on exposed servers, restricting network access to VFP-related interfaces or limiting low-privilege account access to vulnerable hosts reduces exposure, though these are imperfect compensating controls that do not eliminate the flaw.
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Same weakness CWE-416 – Use After Free
View allSame technique Denial Of Service
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External POC / Exploit Code
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