CVE-2025-59250

What it actually does

Improper input validation in the JDBC Driver for SQL Server permits crafted network inputs to bypass checks, enabling spoofing of client or server identities and subsequent unauthorized data flows.

Why it matters to the business

Organizations relying on SQL Server connections through affected drivers face potential unauthorized access to database resources, increasing risk of data exposure or integrity issues without requiring authentication.

How an attack unfolds

An attacker on the network sends specially formatted requests to the vulnerable JDBC driver that exploit weak input validation, allowing impersonation of a legitimate endpoint to intercept queries, responses, or credentials.

How to fix it

Upgrade the Microsoft JDBC Driver for SQL Server to a build containing commit 5c9cd93f057de5322973b427583e8603a2bc0fc7; apply the listed Red Hat kpatch updates (0:1-4.el7, 0:1-3.el7, or 0:1-1.el7) for affected packages.

How to confirm the fix worked

Confirm driver version or kpatch package revision matches fixed releases, then perform controlled network tests with invalid inputs to verify rejection; review connection logs for absence of previously accepted spoof attempts.

Typical attack path

1. Scan for exposed SQL Server JDBC endpoints
2. Craft and transmit malformed input payloads over the network
3. Bypass validation to establish a spoofed session
4. Intercept or manipulate database traffic for data access or tampering

How to detect it

Examine application and driver logs for rejected or unexpected connection attempts involving SQL Server; correlate with network flow data for anomalous source identities or protocol deviations.

What your security team should do

• Apply driver and kpatch updates immediately given the high CVSS and network attack vector
• Enforce encrypted connections and certificate validation for all JDBC traffic
• Implement network segmentation to limit exposure of database endpoints