Telerik UI for ASP.NET AJAX Unrestricted File Upload Vulnerability

CRITICAL 9.8EXPLOITED (CISA KEV)CVE-2017-11317 · Published 23/08/2017 · updated 17/06/2026

Telerik UI for ASP.NET AJAX Unrestricted File Upload Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 11/04/2022. Patch affected systems as an emergency.

Package	Affected versions	Patched versions
ui for asp.net ajax telerik	`= 2017.2.503= 2017.2.621≤ 2016.3.1027`	No fix yet

Description

Telerik.Web.UI in Progress Telerik UI for ASP.NET AJAX before R1 2017 and R2 before R2 2017 SP2 uses weak RadAsyncUpload encryption, which allows remote attackers to perform arbitrary file uploads or execute arbitrary code.

References

packetstormsecurity.com/files/159653/Telerik-UI-ASP.NET-AJAX-RadAsyncUpload-Deserialization.html · Exploit
telerik.com/support/kb/aspnet-ajax/upload-%28async%29/details/unrestricted-file-upload · Mitigation
psirt.global.sonicwall.com/vuln-detail/SNWLID-2018-0006 · Third Party Advisory
exploit-db.com/exploits/43874 · Exploit
cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
CISA KEV · CVE-2017-11317

Running one of these products? Scan your site to see whether it exposes a vulnerable version.

Scan my site free