Microsoft April 2025 Security Updates: Critical Patches & Security Best Practices

On April 8, 2025, Microsoft released a comprehensive set of security updates addressing multiple vulnerabilities across its product suite. This release, part of Microsoft's regular Patch Tuesday schedule, underscores the company's commitment to maintaining the security and integrity of its software ecosystem.

Overview of the April 2025 Security Updates​

The April 2025 security updates encompass a wide range of Microsoft products, including Windows operating systems, Microsoft Office, Visual Studio, and various server components. A total of 126 Common Vulnerabilities and Exposures (CVEs) were addressed in this release, highlighting the extensive scope of the update. (answers.microsoft.com)

Key Vulnerabilities Addressed​

Among the critical vulnerabilities patched are:

• Windows Local Security Authority (LSA): A vulnerability that could allow for privilege escalation, enabling attackers to gain higher-level access to systems.
• Windows NTFS: A flaw that could lead to remote code execution, posing significant risks if exploited.
• Microsoft Edge (Chromium-based): Multiple vulnerabilities that could compromise user data and system integrity.

These vulnerabilities, if left unpatched, could allow attackers to execute arbitrary code, escalate privileges, or cause denial-of-service conditions.

Specific Product Updates​

Windows Server 2025​

For Windows Server 2025, the cumulative update KB5055523 was released, elevating the OS build to 20348.3775. This update addresses several issues, including:

• Kerberos Authentication Vulnerability: A critical flaw that could allow attackers to bypass authentication mechanisms.
• Windows Subsystem for Linux (WSL): An issue causing WSL to stop working and fail to start.
• Deployment Image Servicing and Management (DISM): A problem where the StartComponentCleanup task would halt at 71% completion, displaying error 6842.

Administrators are advised to apply this update promptly to mitigate potential security risks. (borncity.com)

Windows 11​

Windows 11 users received updates addressing vulnerabilities in components such as the Windows DWM Core Library and Windows Kernel. These updates are crucial for maintaining system stability and security.

Critical Patches and Recommendations​

The Office of Information Technology Services (ITS) issued an advisory (2025-036) detailing the critical patches released on April 8, 2025. The advisory emphasizes the importance of applying these patches to prevent potential exploitation. Key recommendations include:

• Apply Patches Promptly: Ensure all systems are updated with the latest security patches to mitigate vulnerabilities.
• Monitor Systems: Regularly check for unusual activity that may indicate exploitation attempts.
• User Training: Educate users on recognizing phishing attempts and other common attack vectors.

Failure to apply these updates could result in unauthorized access, data breaches, and other security incidents. (its.ny.gov)

End of Support Notifications​

In addition to the security updates, Microsoft announced the end of support for several products in 2025. Notable among these are:

• Dynamics GP 2015 and Dynamics GP 2015 R2: Support ended on April 8, 2025.
• SQL Server 2012 (Extended Security Update Year 3): Support ends on July 8, 2025.

Organizations using these products should plan for upgrades or migrations to supported versions to maintain security and compliance. (learn.microsoft.com)

Conclusion​

The April 8, 2025, security updates from Microsoft address a broad spectrum of vulnerabilities across multiple products. Timely application of these patches is essential to protect systems from potential threats. Organizations are encouraged to review the updates relevant to their environments and implement them without delay.
Staying informed about such updates and adhering to recommended security practices are vital steps in safeguarding digital assets against evolving cyber threats.

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Source: Microsoft Support April 8, 2025—Baseline - Microsoft Support