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

criticalknown exploitedpublic exploitCVE-2019-18935
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: Progressproduct: Telerik UI for ASP.NET AJAXUnsafe deserialization
What
A deserialization of untrusted data vulnerability can lead to code execution on the server.
Who is affected
Deployments of Progress Telerik UI for ASP.NET AJAX.
Urgency
Immediate action is required due to the critical nature of the vulnerability and confirmed exploitation.
Action
Apply the latest security updates from Progress.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2019-18935

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2019-18935coverage & exploitation statusNVD · CVE.org

Recent advisories for Progress Telerik UI

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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