CVE-2019-18935: Progress Telerik UI for ASP.NET AJAX Deserialization of Untrusted Data Vulnerability

Vulnerability summary

CVE-2019-18935 is a critical (CVSS 9.8) Deserialization of Untrusted Data vulnerability in Progress Telerik UI for ASP.NET AJAX. It is known to be exploited: CISA lists it, first on 03-11-2021. It has been used in ransomware campaigns. EPSS estimates a 99.74% chance of exploitation in the next 30 days, higher than 99.9% of scored vulnerabilities. 6 public exploits are recorded.

Timeline

1. 11-12-2019
   PublishedVulnerability first disclosed.
2. 03-11-2021
   Added to CISA KEVProgress Telerik UI for ASP.NET AJAX Deserialization of Untrusted Data Vulnerability
3. 03-05-2022
   CISA remediation dueApply updates per vendor instructions.
4. 21-10-2025
   Last modifiedVulnerability information updated.

Description

Progress Telerik UI for ASP.NET AJAX through 2019.3.1023 contains a .NET deserialization vulnerability in the RadAsyncUpload function. This is exploitable when the encryption keys are known due to the presence of CVE-2017-11317 or CVE-2017-11357, or other means. Exploitation can result in remote code execution. (As of 2020.1.114, a default setting prevents the exploit. In 2019.3.1023, but not earlier versions, a non-default setting can prevent exploitation.)

• CWE-502Deserialization of Untrusted DataThe product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.