Microsoft .NET 3.1/5.0 denial of service

A vulnerability was found in Microsoft .NET 3.1/5.0. It has been classified as problematic. Affected is an unknown code block. Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.


A denial of service vulnerability exists when ASP.NET Core improperly handles client disconnect.

Affected software

  • Any .NET 5.0 application running on .NET 5.0.6 or lower
  • Any .NET Core 3.1 application running on .NET Core 3.1.15 or lower

Common Vulnerability Scoring System Score Details

  1. CVSS v3 Vector:  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
  2. CVSS v3 Base Score:    5.9
  3. Attack Vector:  Network
  4. Attack Complexity:      High
  5. Availability Impact:      High

Common Vulnerabilityies and Exposures

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