Heap-Based Buffer Overflow in Windows SPNEGO Extended Negotiation
CVE-2025-47981

9.8CRITICAL

Key Information:

Vendor: Microsoft
Status: Windows 10 Version 1809; Windows Server 2019; Windows Server 2019 (server Core Installation); Windows Server 2022
Vendor: CVE Published:; 8 July 2025

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What is CVE-2025-47981?

CVE-2025-47981 is a critical vulnerability affecting the Windows SPNEGO Extended Negotiation, which is an integral part of Microsoft’s security infrastructure that facilitates authentication processes. This vulnerability arises from a heap-based buffer overflow, allowing unauthorized attackers to execute arbitrary code over a network. If exploited, it can compromise the confidentiality, integrity, and availability of the affected system, enabling attackers to manipulate data or gain unauthorized access to sensitive information. The implications of such exploitation can severely undermine organizational security and operational continuity.

Potential Impact of CVE-2025-47981

Remote Code Execution: The vulnerability permits attackers to execute malicious code remotely, which can lead to the complete takeover of affected systems, potentially facilitating further attacks or data exfiltration.
Unauthorized Access: Exploitation can result in unauthorized access to sensitive information and resources, exposing organizations to data breaches and potential compliance violations.
Network Compromise: The ability to execute code remotely can allow attackers to spread malware within an organization’s network, leading to broader system compromises and increased risks of ransomware attacks.