Cybersecurity Threat Advisory: Microsoft SQL server zero-day vulnerability

Cybersecurity Threat Advisory

Cybersecurity Threat AdvisoryA critical information disclosure vulnerability has been identified in Microsoft SQL Server, designated as CVE-2025-49719 with a CVSS score of 7.5. This vulnerability allows unauthorized attackers to access sensitive data over a network, posing a serious risk to organizations that rely on SQL Server for their database management. Read this Cybersecurity Threat Advisory to find out how to stay protected.

What is the threat?

The vulnerability in Microsoft SQL Server enables attackers to exploit improper input validation to gain unauthorized access to sensitive information. This information disclosure flaw could allow attackers to view confidential data stored in SQL Server databases. The vulnerability can be exploited remotely over a network, increasing the potential attack surface.

Why is this noteworthy?

CVE-2025-49719 is particularly noteworthy because it can be exploited remotely over the network without requiring user interaction or authentication. It affects Microsoft SQL Server, which serves as a core component of many organizations’ data infrastructure, making the potential impact widespread. Although Microsoft has publicly disclosed the vulnerability, it currently assesses the likelihood of active exploitation as low. The issue affects several SQL Server versions, including widely used enterprise deployments from 2016 through 2022.

What is the exposure or risk?

Organizations running vulnerable Microsoft SQL Server versions face significant risk. Attackers could access sensitive data such as personally identifiable information (PII), financial records, or proprietary business information.

Attackers might use the exposed information to facilitate further attacks, causing organizations to violate data protection regulations such as GDPR, HIPAA, or PCI DSS. This could ultimately damage organizational reputation and customer trust if a breach occurs. Organizations increase their risk when they run internet-facing SQL Server instances or fail to implement proper network segmentation.

What are the recommendations?

Barracuda recommends the following actions to protect against this vulnerability:

  • Apply Microsoft’s July 2025 security updates as soon as possible.
  • Segment affected SQL Server instances from the internet and other untrusted networks.
  • Review authentication mechanisms and ensure strong authentication is in place for all SQL Server instances and that principle of least privilege is enforced.
  • Enable comprehensive logging for SQL Server activities to detect potential exploitation attempts.

How can Barracuda protect you against this threat?

Barracuda offers several solutions that can help protect against this vulnerability:

  • Barracuda Managed XDR: Provides 24/7 monitoring and threat detection capabilities to identify suspicious activities targeting SQL Server instances. The service includes expert security analysts who can help detect and respond to exploitation attempts.
  • Barracuda Backup: Offers comprehensive backup solutions for SQL Server databases, ensuring that data can be recovered in case of a breach or data corruption. Barracuda Backup provides efficient protection for Microsoft SQL Server environments.
  • Barracuda CloudGen Firewall: Delivers advanced network protection to help prevent unauthorized access to SQL Server instances from external networks.
  • Barracuda Web Application Firewall: Protects web-facing applications that interface with SQL Server, blocking injection attempts and other exploits that could lead to unauthorized data access.

Reference

For more in-depth information about the recommendations, please visit the following link:

https://cybersecuritynews.com/microsoft-sql-server-0-day-vulnerability/

If you have any questions about this Cybersecurity Threat Advisory, don’t hesitate to get in touch with Barracuda Managed XDR’s Security Operations Center.

This post originally appeared on Smarter MSP.

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