To exploit the vulnerability, an attacker would first have to convince the user to open a malicious document or application. This security update addresses the vulnerability by correcting how .NET Framework validates untrusted input. To learn more about this vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2018-8421.

There are different ways to remove apps and programs, so if you can't find the one you're looking for, you can try another location. Note that some apps and programs are built into Windows and can't be uninstalled. You can try to repair a program first, if it's just not running correctly.

First, you'll need to download the troubleshooter. Download troubleshooter. If you see the File Download box when you start downloading, select Run or Open. The troubleshooter provides steps for you to follow. If a program isn't listed in the uninstall options, you'll be asked for that program's product code.

Locate the .NET Framework packages that match the operating systems, languages, and processors in your environment. Select Add to add them to your basket.

Resolves a remote code execution vulnerability that exists when Microsoft .NET Framework does not validate input correctly.

To resolve this issue, install the August Security and Quality Rollup KB 4345590. This update is available through Windows Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to get security updates automatically, see Windows Update: FAQ.

To remove this update, use the Programs and Features item in Control Panel. This update doesn't require a system restart after you apply it unless files that are being updated are locked or are being used. This update replaces previously released updates KB 4471987, KB 4471990, KB 4467224, and KB 4467227.

This security update resolves a vulnerability in the Microsoft .NET Framework that could allow remote code execution when Microsoft .NET Framework processes untrusted input. An attacker who successfully exploits this vulnerability by using the .NET Framework could take control of an affected system.

When critical Windows system files are missing or corrupted, your operating system may begin to malfunction. Common symptoms include Windows features not working properly, system errors, or Windows becoming unresponsive or freezing.

To remove this update, use the Programs and Features item in Control Panel. This update does not require a system restart after you apply it unless files that are being updated are locked or are being used. This update replaces previously released updates 4487078 and 4487256 and 4487081 and 4487259.