CVE-2017-9248
Progress Telerik UI for ASP.NET AJAX and Sitefinity Cryptographic Weakness Vulnerability
Published Jul 3, 2017 · updated Jun 16, 2026 · progress sitefinity
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.
Timeline
Detection, updates, and resolution for this record.
Jul 3, 2017 · Catalog
Detected
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.
Nov 3, 2021 · CISA KEV
Known exploited
Apply updates per vendor instructions.
May 3, 2022 · CISA KEV
Remediation due
Apply updates per vendor instructions.
Jun 16, 2026 · Catalog
Updated
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.
Required action
Apply updates per vendor instructions.
CISA due date May 3, 2022
Affected
- cpe progress/sitefinityversion unspecified
- cpe telerik/ui for asp.net ajaxversion unspecified
- vendor Progress ASP.NET AJAX and Sitefinityversion unspecified
Sources
- CISA KEVCVE-2017-9248
Progress Telerik UI for ASP.NET AJAX and Sitefinity have a cryptographic weakness in Telerik.Web.UI.dll that can be exploited to disclose encryption keys (Telerik.Web.UI.DialogParametersEncryptionKey and/or the MachineKey), perform cross-site-scripting (XSS) attacks, compromise the ASP.NET ViewState, and/or upload and download files.
cisa.gov - CVE.orgCVE-2017-9248
Official CVE identifier
cve.org - FIRST EPSSCVE-2017-9248
30-day exploitation probability 75.1%
first.org - Exploit Database43873
Public archive entry. The exploit body is not stored here.
exploit-db.com - NIST NVDCVE-2017-9248
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
nvd.nist.gov