Summary of KB4021558 Update Fixing Error 80072EEF
KB4021558 is an update for Windows 7 SP1, Windows Server 2008 R2 SP1, and Windows Embedded POSReady 7. This cumulative security update addresses multiple vulnerabilities in the Microsoft .NET Framework that could allow remote code execution if a user were to view specially crafted content or open a specially crafted file on their device.
This update includes improvements for quality issues found in previous updates as well as resolving numerous security vulnerabilities related to various components of the .NET Framework, including Windows Shell, Web Services for Microsoft SQL Server (MSMQ), and more. It enhances security features and improves overall stability and performance by fixing several known bugs reported by users since the last cumulative update.
Description of KB4021558: What’s Patched to Resolve Error 80072EEF
This update resolves 25 unique vulnerabilities in various components of .NET Framework including Windows Shell, ASP.NET Core, Web Services for Microsoft SQL Server (MSMQ), and more. Specifically, it addresses issues related to bypassing security features, remote code execution through specially crafted files or web content, denial-of-service conditions caused by improper handling of objects in memory, and information disclosure vulnerabilities.
Additionally, the update fixes several non-security quality bugs reported since the last cumulative release. These include improvements for compatibility with external software applications, enhancing performance optimizations within .NET Framework services, and resolving issues that affect end-user experience negatively.
Howto install KB4021558
To install KB4021558 on your system, follow these detailed steps:
- Navigate to the Microsoft Update Catalog website or visit the official Microsoft Support page for download links of the specific update you need.
- Select and download the appropriate x86 or x64 version of the .NET Framework 3.5 SP1 and .NET Framework 4.7.2 package according to your operating system architecture from the provided links.
- After downloading, run the installer for each package you downloaded one by one.
- Follow on-screen instructions during installation to accept licensing terms and confirm updates.
- If prompted, restart your computer after completing all installations.
- To verify successful installation, open Control Panel > Programs and Features (or Add/Remove Programs) and check for the installed version of .NET Framework 3.5 SP1 and 4.7.2 or later.
Similar questions
What is update KB4021558 and how does it affect my computer’s performance?
Will installing update KB4021558 fix any known security vulnerabilities on Windows 10 or earlier versions?
How can I check if update KB4021558 is already installed on my system without opening the control panel?
Can you explain in simple terms what issues does update KB4021558 resolve for users of Microsoft Office products?
If I install update KB4021558, will it cause any problems with third-party software compatibility or drivers?
How do I uninstall update KB4021558 if my computer starts acting weird after installing it?
Is there a way to pause the installation of update KB4021558 until I’m ready for it without turning off automatic updates completely?
What are the system requirements and minimum hardware specifications needed to install update KB4021558 successfully?
After applying update KB4021558, will my computer need a restart right away or can it be deferred?
Does update KB4021558 come with any new features that could improve my day-to-day use of Windows 10?