KB4533094 for .NET Framework 3.5, 4.7.2, and 4.8 Windows 10 1809

On 10th Dec 2019, Windows 10 receives KB4533094 for .NET Framework versions 3.5, 4.7.2, and 4.8. The company rolls this update especially for Windows 10 version 1809 and Windows Server 2019. Moreover, this security update comprises a few quality as well as reliability improvements. A few of them involve corrections under ASP.NET, WPF, and CLR.

One should read the Prerequisites as well as the Restart requirement section before applying any monthly patch update. Meanwhile, Check out the list of the entire fixes at Windows 10 Cumulative Update.


Quality and reliability improvements

The below section explains the additional information about KB4533094 as this relates to individual product versions –
Cumulative Update  

Additional Information





At present, ASP.NET releases a SameSite cookie header when HttpCookie.SameSite value is “None”. This is performed so as to adjust the upcoming changes to SameSite cookie handling in Chrome.

Earlier, FormsAuth and SessionState cookies are issued with SameSite = ‘None’. However, they are now presented with the “Lax” value. You may override these values inside web.config. To know more, refer to this article




Works upon an issue wherein some Per-Monitor Aware WPF apps that run on .NET 4,8 stops suddenly displaying the following crash error –





This resolves the anomaly where some ClickOnce apps or applications creating the default AppDomain with a restricted permission set may result in app runtime failures or unexpected behaviors. 

Besides, one may observe the System.AppDomainSetup.TargetFrameworkName being null, thus prompting any quirks that revert back the .NET Framework to 4.0.

Note: WPF stands for Windows Presentation Foundation whereas CLR for Common Language Runtime.

How to download and install KB4533094 for Windows 10 1809

Further, you may download KB4533094 patch update visiting Windows Update FAQ section

December 2019 – Last Patch Update

Lastly, here is the complete list of the latest cumulative update of December 2019 through the update catalog –