Executive brief
Microsoft SQL Server contains a heap-based buffer overflow vulnerability that allows an authenticated attacker with network access to execute arbitrary code and elevate privileges on the server. This could lead to complete compromise of the database server, exposing sensitive customer data and disrupting critical business operations that depend on the database.
Technical details
The vulnerability is a heap-based buffer overflow in Microsoft SQL Server that can be triggered by an authorized network attacker. The root cause involves improper bounds checking in memory allocation, allowing an attacker to overflow a heap buffer and potentially overwrite adjacent memory structures. Exploitation requires an authenticated connection to the SQL Server instance but no additional user interaction. A successful exploit enables arbitrary code execution with the privileges of the SQL Server process, typically leading to privilege escalation on the host system. Microsoft has issued patches available through the Security Update Guide.
Affected products
- Microsoft SQL Server
Timeline
- 2026-09-08: disclosed