November 3, 2021 · Applied Cybernetics Group
CVE-2019-18935 — Progress Telerik UI for ASP.NET AJAX
known ransomware use
Progress Telerik UI for ASP.NET AJAX Deserialization of Untrusted Data Vulnerability
- Added to KEV
2021-11-03- Federal due date
2022-05-03- Vendor
- Progress
- Product
- Telerik UI for ASP.NET AJAX
- EPSS
- 99.9th percentile (score 0.937, as of
2026-06-08) - NVD CVSS v3.1
- —
- Ransomware use
- Known
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2019-18935
CISA short 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.
Required action
Apply updates per vendor instructions.