EUVD-2026-44100
GHSA-pf26-75r6-gmxv
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable Netlogon RPC with low-privilege authentication required (PR:L) and no user interaction; use-after-free yields full host compromise, so C/I/A all High.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
Lifecycle Timeline
5DescriptionNVD
Use after free in Windows Netlogon allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Privilege escalation in the Windows Netlogon service allows an authenticated network attacker to gain elevated privileges by triggering a use-after-free (CWE-416) memory-corruption condition. The flaw affects a broad range of supported Windows client and server builds, from Windows Server 2012 through Windows 11 25H2/26H1 and Windows Server 2025, and was reported by Microsoft. There is no public exploit identified at time of analysis and CISA SSVC currently rates exploitation as none, with a low EPSS of 0.62%.
Technical ContextAI
Netlogon is the Windows authentication service (netlogon.dll / the Netlogon Remote Protocol MS-NRPC) responsible for user and machine authentication against domain controllers, secure-channel establishment, and NTLM pass-through validation. The root cause is a use-after-free (CWE-416): the service references a heap object after it has been freed, and by controlling reallocation of that memory an attacker can corrupt state to redirect execution or manipulate privileged data. Because Netlogon runs with high privilege and is reachable over the network via RPC, memory-corruption in this component translates directly into local privilege elevation. The CPE and EUVD data confirm the affected code ships across Windows 10 (1607/1809/21H2/22H2), Windows 11 (24H2/25H2/26H1), and Windows Server 2012 through 2025, including Server Core installations.
RemediationAI
Vendor-released patch: apply the Microsoft security update that raises each affected build to at least the fixed version listed for its SKU - for example Windows Server 2019 to 10.0.17763.9020, Windows 10 22H2 to 10.0.19045.7548, Windows 11 24H2 to 10.0.26100.8875, Windows 11 26H1 to 10.0.28000.2525, Windows Server 2022 to 10.0.20348.5386, and Windows Server 2025 to 10.0.26100.33158 - per the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50500. Prioritize domain controllers and internet- or lab-exposed servers. As Netlogon is core to domain authentication it cannot simply be disabled without breaking domain functionality, so where immediate patching is not possible restrict RPC/Netlogon (MS-NRPC over the domain controller's RPC endpoints, typically TCP 135 plus dynamic RPC ports) to trusted management networks via host firewall and network segmentation, and tighten monitoring of anomalous Netlogon/RPC traffic and privilege-escalation events; these controls reduce reachability but do not remove the underlying flaw and may impact legitimate authentication if scoped too tightly.
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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
Leaving vuln.today