CVE-2026-72982 in Windows
Summary
by MITRE • 09/08/2026
Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability described constitutes a critical security flaw within the Microsoft Windows Netlogon service, specifically manifesting as a stack-based buffer overflow condition that can be exploited remotely by unauthenticated attackers. The Netlogon service is responsible for establishing secure channels between domain controllers and member computers or other domain controllers, handling authentication requests and maintaining trust relationships within an Active Directory environment. When processing specific network packets related to these security channel negotiations, the service fails to adequately validate the length of input data before copying it into a fixed-size buffer located on the call stack. This lack of boundary checking allows an attacker to supply crafted data that exceeds the allocated memory space, thereby overwriting adjacent memory locations including critical control flow information such as return addresses and instruction pointers.
Exploitation of this flaw enables arbitrary code execution with the privileges of the Netlogon service process, which typically runs under high-privilege system accounts depending on the specific configuration and role of the affected machine within the domain hierarchy. An attacker positioned on the network can send specially crafted RPC packets to trigger the overflow without requiring valid credentials or prior authentication. This characteristic classifies the vulnerability as a remote code execution flaw that bypasses standard access controls, allowing for immediate compromise of the targeted system upon successful exploitation. The impact is severe because it grants the attacker full control over the affected machine, facilitating further lateral movement within the network, data exfiltration, persistence establishment, and potential escalation to domain administrator privileges if the compromised host serves as a critical infrastructure component such as a Domain Controller.
From an industry standards perspective, this vulnerability aligns with CWE-120 Buffer Copy without Checking Size of Input Classic buffer overflow and specifically CWE-787 Out-of-bounds Write when considering the memory corruption aspect. In terms of attack tactics, it maps to MITRE ATT&CK techniques involving Remote Services such as SMB/NetBIOS or RPC for initial access and potentially Command Line Interface execution if payload delivery is successful. The nature of this flaw highlights the risks associated with complex network services that handle untrusted input from potential adversaries on shared networks. Mitigation strategies primarily involve applying vendor-provided security patches to update the Netlogon service binaries, ensuring that systems are kept current with the latest cumulative updates released by Microsoft. Additionally, organizations should implement strict network segmentation and firewall rules to restrict access to Netlogon ports (typically TCP 135 and dynamic RPC ranges) from untrusted networks or unauthorized hosts. Monitoring for anomalous authentication patterns and unusual outbound connections can also aid in detecting exploitation attempts before full compromise occurs.