CVE-2020-1108: Microsoft .net

High severity, CVSS 7.5. EPSS: 6.4% chance of exploitation in the next 30 days.

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 products

• Microsoft .net: version 5.0 only
• Microsoft .net Core: from 2.1, up to and including 2.1.18; from 3.0, up to and including 3.1.4; version 2.1 only; version 3.1 only
• Microsoft .NET Framework: version 2.0 only; version 3.0 only; version 4.6 only; version 3.5 only; version 4.5.2 only; version 4.6.1 only; …
• Microsoft PowerShell: version 7.0 only
• Microsoft PowerShell Core: version 6.2 only
• Microsoft Visual Studio 2017: version 15.9 only
• Microsoft Visual Studio 2019: version 16.0 only; version 16.4 only; version 16.5 only

Published 2020-05-21. Last modified 2026-08-19.