CVE-2019-18935
telerik ui for asp.net ajax
Published 11 Dec 2019 · updated 17 Jun 2026 · Analyzed
Exploited in the wild
CISA added this to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, with a remediation deadline of 3 May 2022 for US federal agencies. It has been used in ransomware campaigns.
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.)
References
- packetstormsecurity.com/files/155720/Telerik-UI-Remote-Code-Execution.html · Third Party Advisory, VDB Entry
- packetstormsecurity.com/files/159653/Telerik-UI-ASP.NET-AJAX-RadAsyncUpload-Deserialization.html · Exploit, Third Party Advisory, VDB Entry
- codewhitesec.blogspot.com/2019/02/telerik-revisited.html · Not Applicable
- github.com/bao7uo/RAU_crypto · Exploit, Third Party Advisory
- github.com/noperator/CVE-2019-18935 · Exploit, Third Party Advisory
- know.bishopfox.com/research/cve-2019-18935-remote-code-execution-in-telerik-ui · Exploit, Third Party Advisory
- www.bleepingcomputer.com/news/security/us-federal-agency-hacked-using-old-telerik-bug-to-steal-data/ · Press/Media Coverage
- www.telerik.com/support/kb/aspnet-ajax/details/allows-javascriptserializer-deserialization · Patch, Vendor Advisory
- www.telerik.com/support/whats-new/aspnet-ajax/release-history/ui-for-asp-net-ajax-r1-2020-%28version-2020-1-114%29 · Release Notes
- www.telerik.com/support/whats-new/release-history · Release Notes, Vendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-18935 · US Government Resource