CVE-2018-8171: Microsoft ASP.NET Core

High severity, CVSS 7.5. EPSS: 10.5% chance of exploitation in the next 30 days.

A Security Feature Bypass vulnerability exists in ASP.NET when the number of incorrect login attempts is not validated, aka "ASP.NET Security Feature Bypass Vulnerability." This affects ASP.NET, ASP.NET Core 1.1, ASP.NET Core 1.0, ASP.NET Core 2.0, ASP.NET MVC 5.2.

Affected products

• Microsoft ASP.NET Core: version 1.0 only; version 1.1 only; version 2.0 only
• Microsoft ASP.NET Model View Controller: version 5.2 only
• Microsoft ASP.NET Webpages: version 3.2.3 only

Published 2018-07-11. Last modified 2026-06-17.