CVE-2019-18935Actively exploitedAdded to KEV 2021-11-03Known ransomware campaign use

Progress Telerik UI for ASP.NET AJAX Deserialization of Untrusted Data Vulnerability

Progress, Telerik UI for ASP.NET AJAX

Description

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.

CVSS severity for this advisory hasn't been enriched from NVD yet, check back shortly.

EPSS, exploit probability

Critical

99.7%

estimated chance of real-world exploitation in the next 30 days, higher than 100.0% of every CVE FIRST.org scores

Refreshed 10/28/2026, via FIRST.org's EPSS model, not CVSS, this measures likelihood of exploitation, not how severe it would be.

Required action

Apply updates per vendor instructions.

CISA-recommended due date: 2022-05-03

CWE-502

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