CVE-2025-59499: 
vulnerability analysis and mitigation

A critical SQL injection vulnerability (CVE-2025-59499) was discovered in Microsoft SQL Server, affecting multiple versions including SQL Server 2016, 2017, 2019, and 2022. The vulnerability was disclosed on November 11, 2025, and allows an authorized attacker to elevate privileges over a network through improper neutralization of special elements used in SQL commands (NVD CVE, Microsoft KB).

The vulnerability has been assigned a CVSS v3.1 base score of 8.8 (HIGH) with the vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. The vulnerability is classified as CWE-89 (Improper Neutralization of Special Elements used in an SQL Command). It affects multiple SQL Server versions including SQL Server 2016 (versions 13.0.6300.2 to 13.0.6475.1), SQL Server 2017 (versions 14.0.1000.169 to 14.0.2095.1), SQL Server 2019 (versions 15.0.2000.5 to 15.0.2155.2), and SQL Server 2022 (versions 16.0.1000.6 to 16.0.1160.1) (NVD CVE).

The vulnerability allows an authorized attacker to execute arbitrary Transact-SQL (T-SQL) commands, potentially leading to elevated privileges and unauthorized system control. Successful exploitation could result in complete compromise of the SQL Server instance, allowing attackers to gain unauthorized access to sensitive data, modify database contents, or execute commands with elevated privileges (Rapid7 Blog).

Microsoft has released security updates to address this vulnerability across all affected versions of SQL Server. Organizations are advised to apply the latest security patches immediately. The updates are available through the Microsoft Update Catalog and can be installed through Windows Update or manual deployment (Qualys Alert).

Security researchers have highlighted this vulnerability as a significant concern during the November 2025 Patch Tuesday releases. SQL Server administrators are specifically advised to prioritize this patch due to its critical nature and the potential for privilege escalation (Rapid7 Blog).