Progress Telerik UI for ASP.NET AJAX before R2 2017 SP2 does not properly restrict user input to RadAsyncUpload, which allows remote attackers to perform arbitrary file uploads or execute arbitrary code.
https://github.com/0xsharz/telerik-scanner-CVE-2019-18935
https://github.com/hlong12042/CVE-2017-11317-and-CVE-2017-11357-in-Telerik
https://github.com/bao7uo/RAU_crypto
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-11357