CVE-2017-0247: Microsoft ASP.NET Model View Controller

High severity, CVSS 7.5. EPSS: 16.9% chance of exploitation in the next 30 days.

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 products

  • Microsoft ASP.NET Model View Controller: version 1.0.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.1.0 only; version 1.1.1 only; …
  • Microsoft Microsoft.aspnetcore.mvc.abstractions: version 1.0.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.1.0 only; version 1.1.1 only; …
  • Microsoft Microsoft.aspnetcore.mvc.apiexplorer: version 1.0.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.1.0 only; version 1.1.1 only; …
  • Microsoft Microsoft.aspnetcore.mvc.cors: version 1.0.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.1.0 only; version 1.1.1 only; …
  • Microsoft Microsoft.aspnetcore.mvc.dataannotations: version 1.0.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.1.0 only; version 1.1.1 only; …
  • Microsoft Microsoft.aspnetcore.mvc.formatters.json: version 1.0.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.1.0 only; version 1.1.1 only; …
  • Microsoft Microsoft.aspnetcore.mvc.formatters.xml: version 1.0.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.1.0 only; version 1.1.1 only; …
  • Microsoft Microsoft.aspnetcore.mvc.localization: version 1.0.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.1.0 only; version 1.1.1 only; …
  • Microsoft Microsoft.aspnetcore.mvc.razor: version 1.0.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.1.0 only; version 1.1.1 only; …
  • Microsoft Microsoft.aspnetcore.mvc.razor.host: version 1.0.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.1.0 only; version 1.1.1 only; …
  • Microsoft Microsoft.aspnetcore.mvc.taghelpers: version 1.0.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.1.0 only; version 1.1.1 only; …
  • Microsoft Microsoft.aspnetcore.mvc.viewfeatures: version 1.0.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.1.0 only; version 1.1.1 only; …
  • Microsoft Microsoft.aspnetcore.mvc.webapicompatshim: version 1.0.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.1.0 only; version 1.1.1 only; …
  • Microsoft System.net.http: version 4.1.1 only; version 4.3.1 only
  • Microsoft System.net.http.winhttphandler: version 4.0.1 only; version 4.3.0 only
  • Microsoft System.net.security: version 4.0.0 only; version 4.3.0 only
  • Microsoft System.net.websockets.client: version 4.0.0 only; version 4.3.0 only
  • Microsoft System.text.encodings.web: version 4.0.0 only; version 4.3.0 only

Published 2017-05-12. Last modified 2026-06-17.