CVE-2025-55227: 
vulnerability analysis and mitigation

CVE-2025-55227 is a command injection vulnerability discovered in Microsoft SQL Server that was disclosed on September 9, 2025. The vulnerability affects multiple versions of SQL Server including SQL Server 2016, 2017, 2019, and 2022. This security flaw stems from improper neutralization of special elements used in commands that could allow an authorized attacker to elevate privileges over a network (NVD, Microsoft Advisory).

The vulnerability has been assigned a CVSS v3.1 base score of 8.8 (HIGH) with the following vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. The flaw is classified as CWE-77 (Improper Neutralization of Special Elements used in a Command). The vulnerability specifically affects SQL Server during internal temporal history table cleanup operations where improper input validation could enable attackers to run SQL code with elevated privileges (Qualys Alert).

Successful exploitation of this vulnerability allows an authorized attacker to elevate their privileges within the SQL Server environment. This could potentially lead to unauthorized access to sensitive data, system compromise, and further attacker access within the network (NVD, Qualys Alert).

Microsoft has released security updates to address this vulnerability. The patches are available for all affected versions of SQL Server including SQL Server 2016 SP3 GDR (version 13.0.6470.1), SQL Server 2017, 2019, and 2022. Organizations are advised to apply these security updates immediately to protect against potential exploitation (Microsoft Advisory).