Rule Document 1:65106

Rule Category

OS-WINDOWS -- Snort has detected traffic targeting vulnerabilities in a Windows-based operating system. This does not include browser traffic or other software on the OS, but attacks against the OS itself. (such as?)

Alert Message

OS-WINDOWS Microsoft Windows SPNEGO Extended Negotiation remote code execution attempt

Rule Explanation

This rule looks for specially crafted SPNEGO Extended Negotiation packets intended to exploit a remote code execution vulnerability in Windows SPNEGO.

What To Look For

This rule fires on attempts to exploit a remote code execution vulnerability in the Windows SPNEGO Extended Negotiation (NEGOEX) Security Mechanism.

Known Usage

No public information

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group

Rule Groups

Rule Categories::Operating Systems::Windows

MITRE::ATT&CK Framework::Enterprise::Initial Access::Exploit Public-Facing Application

Adversaries may attempt to take advantage of a weakness in an Internet-facing computer or program using software, data, or commands in order to cause unintended or unanticipated behavior. The weakness in the system can be a bug, a glitch, or a design vulnerability. These applications are often websites, but can include databases (like SQL), standard services (like SMB or SSH), network device administration and management protocols (like SNMP and Smart Install), and any other applications with Internet accessible open sockets, such as web servers and related services.

Vulnerability::Severity::Critical

Vulnerability::Severity::High

CVE

CVE-2025-47981

Additional Links

msrc.microsoft.com/update-guide/vulnerability/CVE-2025-47981

Rule Vulnerability

Memory Corruption

Memory Corruption is any vulnerability that allows the modification of the content of memory locations in a way not intended by the developer. Memory corruption results are inconsistent; they could lead to fatal errors and system crashes or data leakage; some have no effect at all.

CVE Additional Information

This product uses data from the NVD API but is not endorsed or certified by the NVD.

CVE-2025-47981

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