A denial of service vulnerability exists when .NET Core or .NET Framework improperly handles web requests

Overview

A denial of service vulnerability exists when .NET Core or .NET Framework improperly handles web requests. An attacker who successfully exploited this vulnerability could cause a denial of service against a .NET Core or .NET Framework web application. The vulnerability can be exploited remotely, without authentication. A remote unauthenticated attacker could exploit this vulnerability by issuing specially crafted requests to the .NET Core or .NET Framework application. The update addresses the vulnerability by correcting how the .NET Core or .NET Framework web application handles web requests.

Affected

• .net = 5.0
• .net_core >= 2.1, <= 2.1.18
• .net_core >= 3.0, <= 3.1.4
• .net_framework = 2.0
• .net_framework = 3.0
• .net_framework = 4.6
• .net_framework = 3.5
• .net_framework = 4.5.2
• .net_framework = 4.6.1
• .net_framework = 4.6.2
• .net_framework = 4.7
• .net_framework = 4.7.1
• .net_framework = 4.7.2
• .net_framework = 4.8
• .net_framework = 3.5.1
• .net_core = 2.1
• .net_core = 3.1
• visual_studio_2017 = 15.9
• visual_studio_2019 = 16.0
• visual_studio_2019 = 16.4
• visual_studio_2019 = 16.5
• powershell = 7.0
• powershell_core = 6.2

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.