Summary
Impact: Remote Code Execution. Microsoft rating: Critical. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
How could an attacker exploit this vulnerability?
An attacker could send a specially crafted network request to a Windows server that is acting as a domain controller. If successful, this could cause the Netlogon service to improperly handle the request, potentially allowing the attacker to run code on the affected system without needing to sign in or have prior access.
Security updates
10.0.17763.8755 — https://support.microsoft.com/help/5087538
10.0.20348.5139 — https://support.microsoft.com/help/5087545
10.0.20348.5074 — https://support.microsoft.com/help/5087424
10.0.26100.32860 — https://support.microsoft.com/help/5087539
10.0.26100.32772 — https://support.microsoft.com/help/5087423
10.0.25398.2330 — https://support.microsoft.com/help/5087541
10.0.14393.9140 — https://support.microsoft.com/help/5087537
6.2.9200.26079 — https://support.microsoft.com/help/5087470
6.3.9600.23181 — https://support.microsoft.com/help/5087471
Vulnerabilities 1
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Critical 9.8
Windows Netlogon Remote Code Execution Vulnerability
Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.
Revision history
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#1
Information published.
References
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CVE-2026-41089 Windows Netlogon Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41089
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss