Progress Telerik UI - RCE (CVE-2019-18935)
3446Exploiting IPs reported
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.)
CrowdSec analysis
CVE-2019-18935 is a critical vulnerability in Progress Telerik UI for ASP.NET AJAX that enables remote code execution through a flawed deserialization process in the RadAsyncUpload functionality, especially when encryption keys are exposed or known.
CrowdSec has been tracking this vulnerability and its exploits since 5th of April 2023.
CrowdSec network data shows that most actors exploiting CVE-2019-18935 rely on broad, untargeted scans with minimal filtering. The activity is largely automated and opportunistic in nature. CrowdSec network telemetry also shows that exploitation of CVE-2019-18935 has significantly declined over the past week. Attack volumes are well below the long-term average, suggesting attackers are rapidly losing interest. The vulnerability appears to be falling out of active use across most threat landscapes.
Observed exploitation frequently involves requests crafted to abuse the RadAsyncUpload feature, leveraging the underlying deserialization flaw for code execution.
Exploitation
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Common Weakness Enumeration (CWE)
Protection
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Blocklist
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