CVE-2017-9248
Critical 9.8 Exploited in the wild (KEV)
Confirmed active exploitation — CISA KEV catalog
- Name
- Progress Telerik UI for ASP.NET AJAX and Sitefinity Cryptographic Weakness Vulnerability
- Added to catalog
- Remediation due date (US federal)
- Required action
- Apply updates per vendor instructions.
Description
Telerik.Web.UI.dll in Progress Telerik UI for ASP.NET AJAX before R2 2017 SP1 and Sitefinity before 10.0.6412.0 does not properly protect Telerik.Web.UI.DialogParametersEncryptionKey or the MachineKey, which makes it easier for remote attackers to defeat cryptographic protection mechanisms, leading to a MachineKey leak, arbitrary file uploads or downloads, XSS, or ASP.NET ViewState compromise.
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
- 75% (percentile: 100) as of 1 November 2026
- CWE
- CWE-522
Affected products
progress: sitefinity; telerik: ui for asp.net ajax
References
- http://www.telerik.com/blogs/security-alert-for-telerik-ui-for-asp.net-ajax-and… Vendor Advisory
- http://www.telerik.com/support/kb/aspnet-ajax/details/cryptographic-weakness MitigationVendor Advisory
- http://www.telerik.com/blogs/security-alert-for-telerik-ui-for-asp.net-ajax-and… Vendor Advisory
- http://www.telerik.com/support/kb/aspnet-ajax/details/cryptographic-weakness MitigationVendor Advisory
- https://www.exploit-db.com/exploits/43873/ ExploitThird Party AdvisoryVDB Entry
- https://www.exploit-db.com/exploits/43873/ ExploitThird Party AdvisoryVDB Entry
- http://www.securityfocus.com/bid/99965 Broken LinkThird Party AdvisoryVDB Entry
- http://www.securityfocus.com/bid/99965 Broken LinkThird Party AdvisoryVDB Entry
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017… US Government Resource