Microsoft Patch Tuesday April 2021 fixes 108 vulnerabilities, including 5 zero-days

Yet another month, yet another Patch Tuesday. With the never-ending cybersecurity threats brought on by the pandemic, it’s essential to understand the importance of Patch Tuesday releases and find ways to efficiently deploy the new updates to remote endpoints.

This Patch Tuesday, Microsoft has released fixes for 108 vulnerabilities, among which 19 are classified as Critical and 89 as Important. Along with these vulnerabilities, Microsoft also released fixes for four publicly disclosed zero-day vulnerabilities and one actively exploited zero-day. Apart from this plethora of vulnerabilities, there were six other Chromium Edge vulnerabilities disclosed earlier this month.

 A lineup of significant updates

 Microsoft released security updates for the following products:

• Microsoft Windows

• Microsoft Office

• Microsoft Windows Codecs Library

• Visual Studio Code

• Microsoft Edge on Chromium

• Microsoft Exchange Server

• Microsoft Graphics Component

 April’s zero-day vulnerabilities: 4 publicly disclosed, 1 actively exploited

This month, Microsoft has released fixes for the zero-day vulnerabilities below:

• CVE-2021-27091: RPC Endpoint Mapper Service Elevation of Privilege Vulnerability – Publicly disclosed

• CVE-2021-28312: Windows NTFS Denial of Service Vulnerability – Publicly disclosed

• CVE-2021-28437: Windows Installer Information Disclosure Vulnerability – PolarBear – Publicly disclosed

• CVE-2021-28458: Azure ms-rest-node authorization Library Elevation of Privilege Vulnerability – Publicly disclosed

• CVE-2021-28310: Win32k Elevation of Privilege Vulnerability – Actively exploited

Shedding some light on this month’s critical updates 

Listed below are the Critical vulnerabilities reported in this month’s Patch Tuesday: 

Third-party updates released this month

 Coinciding with this month’s Patch Tuesday, Adobe has also released security updates. There are also notable updates from Android, Apple, SAP, and Cisco. 

Sign up for our free webinar on Patch Tuesday updates for a complete breakdown of the security, non-security, and third-party updates released this Patch Tuesday.

 Here are a few best practices for remote patch management that you can follow in your organization:

• Prioritize security updates over non-security or optional updates.

• Download patches directly to endpoints rather than saving them on your server and distributing them to remote locations.

• Schedule automation tasks specifically for deploying critical patches for timely updates.

• Plan to set broad deployment windows so critical updates aren’t missed due to unavoidable hindrances.

• Allow end users to skip deployments to avoid disrupting their productivity.

• Ensure the machines under your scope aren’t running any end-of-life OSs or applications.

• Ensure you use a secure gateway server to establish safe connections between your remote endpoints.

Want to learn how you can easily implement these best practices using Patch Manager Plus or Desktop Central? Register for our free ManageEngine Patch Tuesday webinar, and watch our experts carry out these best practices in real time. You’ll also gain insights on trending cybersecurity incidents, and our product specialists will be available to clarify any questions you might have.

 Happy patching!