CVE-2020-1045 — Microsoft ASP.NET Core Security Feature Bypass Vulnerability

Affected: Microsoft ASP.NET Core 2.1, Microsoft ASP.NET Core 3.1

A security feature bypass vulnerability exists in the way Microsoft ASP.NET Core parses encoded cookie names. The ASP.NET Core cookie parser decodes entire cookie strings which could allow a malicious attacker to set a second cookie with the name being percent encoded. The security update addresses the vulnerability by fixing the way the ASP.NET Core cookie parser handles encoded names.

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CVE-2020-1045 — Microsoft ASP.NET Core Security Feature Bypass Vulnerability