SOURCE FACT
Progress · Telerik UI for ASP.NET AJAX
Progress Telerik UI for ASP.NET AJAX contains a deserialization of untrusted data vulnerability through RadAsyncUpload which leads to code execution on the server in the context of the w3wp.exe process.
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CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2019-18935
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