CISA KEV catalog
Confirmed active exploitation.
Listed in CISA's catalog of Known Exploited Vulnerabilities: attackers are using it in real attacks. Patch it with priority.
- Name
- Progress Telerik UI for ASP.NET AJAX Deserialization of Untrusted Data Vulnerability
- Added to catalog
- Remediation due date (US federal)
- Required action
- Apply updates per vendor instructions.
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.)
Affected products
telerik: ui for asp.net ajax
References10
- www.telerik.com/support/kb/aspnet-ajax/details/allows-javascrip… PatchVendor Advisory
- www.telerik.com/support/whats-new/release-history Release NotesVendor Advisory
- www.telerik.com/support/kb/aspnet-ajax/details/allows-javascrip… PatchVendor Advisory
- www.telerik.com/support/whats-new/release-history Release NotesVendor Advisory
- packetstormsecurity.com/files/159653/Telerik-UI-ASP.NET-AJAX-Ra… ExploitThird Party AdvisoryVDB Entry
- github.com/bao7uo/RAU_crypto ExploitThird Party Advisory
- github.com/noperator/CVE-2019-18935 ExploitThird Party Advisory
- know.bishopfox.com/research/cve-2019-18935-remote-code-executio… ExploitThird Party Advisory
- packetstormsecurity.com/files/159653/Telerik-UI-ASP.NET-AJAX-Ra… ExploitThird Party AdvisoryVDB Entry
- github.com/bao7uo/RAU_crypto ExploitThird Party Advisory
Metrics
- CVSS 3.1
-
9.8
CRITICAL
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 100% percentile: 100 · as of 10 November 2026
- CWE
- CWE-502
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