Rule Document 1:65103

Rule Category

SERVER-MSSQL -- Snort has detected traffic exploiting vulnerabilities in Microsoft SQL Server servers.

Alert Message

SERVER-MSSQL Microsoft SQL Server memory leak attempt

Rule Explanation

This rule searches for SQL queries that attempt to exploit a memory leak vulnerability through malicious REPLACE queries with UTF-16 characters.

What To Look For

This rule alerts on attempts to exploit a memory leak vulnerability in Microsoft SQL.

Known Usage

No public information

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group

Rule Groups

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.

Rule Categories::Server::SQL Server

MITRE::ATT&CK Framework::Enterprise::Reconnaissance::Gather Victim Host Information

Adversaries may gather information about the victim's hosts that can be used during targeting. Information about hosts may include a variety of details, including administrative data (ex: name, assigned IP, functionality, etc.) as well as specifics regarding its configuration (ex: operating system, language, etc.).

Vulnerability::Severity::Critical

Vulnerability::Severity::High

CVE

CVE-2025-49718

Additional Links

msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49718

Rule Vulnerability

Information Leak

Information Leakage happens when an attacker manipulates a system into revealing sensitive information, either through malformed input or by taking advantage of another feature of the system.

CVE Additional Information

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

CVE-2025-49718

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