CVE-2026-62792 in Windows
Summary
by MITRE • 08/11/2026
Stack-based buffer overflow in Windows TCP/IP allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 08/12/2026
This vulnerability represents a critical stack-based buffer overflow within the Windows TCP/IP networking stack that enables remote code execution by unauthenticated attackers. The flaw occurs when the system processes malformed network packets, specifically within the tcpip.sys kernel driver responsible for handling TCP/IP protocol operations. When an attacker sends specially crafted packets to a vulnerable Windows system, the buffer overflow can be triggered during packet processing, potentially allowing arbitrary code execution with system-level privileges. This type of vulnerability falls under CWE-121 Stack-based Buffer Overflow, which occurs when data is written beyond the bounds of a fixed-length buffer allocated on the stack. The attack vector operates entirely over the network without requiring any authentication or local access to the target system.
The operational impact of this vulnerability extends across all supported Windows operating systems including windows 7, windows server 2008, windows 8, windows server 2012, windows 10, and windows server 2016, making it particularly dangerous for enterprise environments. Attackers can exploit this weakness by sending malformed TCP packets to the target system, potentially leading to complete system compromise including privilege escalation, data theft, or persistent backdoor installation. The vulnerability can be leveraged in automated exploitation campaigns as it requires no user interaction and operates entirely through network protocols. This aligns with ATT&CK technique T1210 Exploitation of Remote Services, where adversaries exploit vulnerabilities in network services to gain unauthorized access to systems.
Mitigation strategies must include immediate deployment of microsoft security updates and patches addressing the specific tcpip.sys vulnerability. Network segmentation and firewall rules should be implemented to restrict unnecessary tcp/ip traffic between internal networks and external interfaces. Additionally, implementing intrusion detection systems capable of identifying malformed tcp packets can provide early warning of exploitation attempts. Organizations should also consider disabling unnecessary network services and ports to reduce the attack surface. The vulnerability demonstrates the critical importance of maintaining up-to-date security patches as it represents a privilege escalation vulnerability that allows attackers to gain system-level control without authentication. Regular security assessments and network monitoring are essential to detect potential exploitation attempts, while endpoint protection solutions should be configured to monitor for suspicious network activity patterns associated with tcp/ip protocol exploitation.