CVE-2017-11317: Telerik UI for ASP.NET AJAX Unrestricted File Upload Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2022-04-11. EPSS: 84.2% chance of exploitation in the next 30 days.

Telerik.Web.UI in Progress Telerik UI for ASP.NET AJAX before R1 2017 and R2 before R2 2017 SP2 uses weak RadAsyncUpload encryption, which allows remote attackers to perform arbitrary file uploads or execute arbitrary code.

Affected products

• Telerik UI For ASP.NET AJAX: up to and including 2016.3.1027; version 2017.2.503 only; version 2017.2.621 only

Published 2017-08-23. Last modified 2026-06-17.