CVE-2025-49719 Overview
Improper input validation in SQL Server allows an unauthorized attacker to disclose information over a network.
Critical Impact
Unauthorized information disclosure via network exploitation
Affected Products
- Microsoft SQL Server 2016
- Microsoft SQL Server 2017
- Microsoft SQL Server 2019
Discovery Timeline
- 2025-07-08 - CVE CVE-2025-49719 published to NVD
- 2025-07-17 - Last updated in NVD database
Technical Details for CVE-2025-49719
Vulnerability Analysis
This vulnerability is classified under CWE-20: Improper Input Validation. It affects multiple versions of Microsoft SQL Server, where improper validation of input data can lead to unauthorized disclosure of sensitive information.
Root Cause
The root cause of this vulnerability lies in the server’s failure to adequately validate user inputs before processing SQL queries. This oversight allows unintended data disclosure through carefully constructed requests.
Attack Vector
The vulnerability can be exploited remotely by an unauthorized attacker via network access. The attacker sends specially crafted queries that exploit the lack of improper input validation.
-- Example exploitation code (sanitized)
SELECT * FROM sensitive_data WHERE id='1 OR 1=1';
Detection Methods for CVE-2025-49719
Indicators of Compromise
- Unusual or unexpected database queries
- Large volume of select statements with no constraints
- Abnormal outbound data flow from the SQL Server
Detection Strategies
Implement query logging and anomaly detection systems to monitor and alert on unusual database commands or access patterns. Employ application firewalls to spot and block suspected SQL injection attempts.
Monitoring Recommendations
Regularly review query logs for signs of suspicious or malicious activity. Use intrusion detection systems to notice pattern changes or repeated access failures.
How to Mitigate CVE-2025-49719
Immediate Actions Required
- Audit and sanitize all incoming data on server side
- Enable input validation in SQL Server configurations
- Restrict network access to SQL Server
Patch Information
Microsoft provides patches for the affected SQL Server versions. Please refer to the Vendor Advisory for download and installation instructions.
Workarounds
As a workaround, implement strict input validation and sanitization practices. Utilize stored procedures to handle database queries, minimizing direct manipulation via user input.
# Configuration example for input sanitization
ALTER PROCEDURE GetEmployeeData (@EmployeeID INT)
AS
BEGIN
SET NOCOUNT ON;
SELECT Name, Position FROM Employees WHERE EmployeeID = @EmployeeID;
END
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
