A denial of service vulnerability exists when the ASP.NET Core fails to properly validate web requests. NOTE: Microsoft has not commented on third-party claims that the issue is that the TextEncoder.EncodeCore function in the System.Text.Encodings.Web package in ASP.NET Core Mvc before 1.0.4 and 1.1.x before 1.1.3 allows remote attackers to cause a denial of service by leveraging failure to properly calculate the length of 4-byte characters in the Unicode Non-Character range.

Affected: NuGet: Microsoft.AspNetCore.Mvc, NuGet: Microsoft.AspNetCore.Mvc.Core, NuGet: System.Net.Http, NuGet: System.Text.Encodings.Web, NuGet: System.Net.Http.WinHttpHandler, NuGet: System.Net.Security, NuGet: System.Net.WebSockets.Client, NuGet: Microsoft.AspNetCore.Mvc.Abstractions, NuGet: Microsoft.AspNetCore.Mvc.ApiExplorer, NuGet: Microsoft.AspNetCore.Mvc.Cors and 9 more

A denial of service vulnerability exists when the ASP.NET Core fails to properly validate web requests. NOTE: Microsoft has not commented on third-party claims that the issue is that the TextEncoder.EncodeCore function in the System.Text.Encodings.Web package in ASP.NET Core Mvc before 1.0.4 and 1.1.x before 1.1.3 allows remote attackers to cause a denial of service by leveraging failure to properly calculate the length of 4-byte characters in the Unicode Non-Character range.