External risk intelligence

Microsoft SQL Server Remote Code Execution Vulnerability

CVE advisoryKnown Exploit

CVE-2019-1068

Microsoft SQL Server is a database management system that is typically deployed in internal, protected network segments behind firewalls or other access controls. While database services can technically be configured for public internet access, it is a poor security practice and not the common deployment pattern for this product role.

Remote Code Execution

Microsoft Sql Server

201413.0.4001.0 to before 13.0.4259.013.0.4411.0 to before 13.0.4604.013.0.5026.0 to before 13.0.5101.913.0.5149.0 to before 13.0.5366.014.0.1000.169 to before 14.0.2027.214.0.3006.16 t...

Halo Surface Signal: 2 out of 5 — less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability in Microsoft SQL Server could allow unauthorized code execution if processed incorrectly. This issue affects how the software handles internal functions, potentially leading to significant security risks if exploited. The primary concern at this time is to confirm if our environment utilizes the affected technology and to what extent it may be exposed.

Code execution flaw in SQL Server.
Confirming impact is the key action.
Assess relevant deployments and potential exposure.

Attack Path

How an attacker could exploit the issue

An attacker with limited privileges could exploit this vulnerability by sending specially crafted requests to Microsoft SQL Server. This could lead to the execution of arbitrary code on the server, potentially allowing the attacker to gain full control of the system.

Requires authenticated, low-privilege access.
Triggered by specially crafted requests.
Allows arbitrary code execution.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability in Microsoft SQL Server could allow an unauthenticated attacker to execute arbitrary code with the privileges of the SQL Server service. This could affect the integrity and availability of the database and any data it stores.

Database integrity and availability.
Remote code execution via network access.
System compromise and data breaches.

Operational Fix

Recommended remediation, mitigation, and detection steps

Infrastructure and database teams are likely responsible for addressing this vulnerability in Microsoft SQL Server. The first practical step is to inventory all SQL Server instances, determine their network exposure and business criticality, and then identify the accountable system owner to plan for remediation.

Database and infrastructure teams own.
Verify SQL Server reachability and criticality.
Plan remediation based on risk assessment.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is Microsoft SQL Server and why is it used?

Microsoft SQL Server is a relational database management system designed to store, retrieve, and manage structured data for enterprise applications. It powers backend operations by handling complex queries and transactions across various organizational platforms, serving as the central repository for critical business information.

What does CWE-20 mean regarding CVE-2019-1068?

CWE-20 refers to Improper Input Validation. In the context of CVE-2019-1068, this means the SQL Server software fails to properly verify or sanitize data before processing it through specific internal functions. Because the system trusts incoming requests without sufficient checks, an attacker can supply malicious input that causes the server to misinterpret instructions, ultimately allowing unauthorized code to run.

How is this SQL Server vulnerability triggered?

An attacker triggers this flaw by sending a specially crafted request to an affected SQL Server instance. A successful exploit relies on the attacker having at least low-level authenticated access to the system. Importantly, the vulnerability is not triggered by standard, legitimate database usage; it requires the specific, malicious manipulation of internal function calls to bypass normal security boundaries.

Is my SQL Server at risk according to Halo Surface Signal?

Halo Surface Signal notes that Microsoft SQL Server is typically deployed within internal, protected network segments rather than directly on the public internet. While the potential for remote exploitation exists if the database is incorrectly exposed to the open web, it is considered an unlikely target for external attacks under standard, secure deployment patterns.

What should I do to address CVE-2019-1068?

Start by identifying all instances of SQL Server within your environment to determine which versions are in use. Assess the network placement and business criticality of each server to prioritize those that might have unnecessary reachability. Once you have an inventory, coordinate with the system owners to review your security posture and plan for the application of official vendor patches.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.