CVE-2017-9248

Name: CVE-2017-9248
Creator: NVD / NIST
Published: 2017-07-03T19:29:00.27+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10Actively ExploitedEPSS 75.10%

Last modified Jun 17, 2026

CVE-2017-9248 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. CISA has confirmed active exploitation in the wild. EPSS estimates a 75.10% chance of exploitation in the next 30 days.

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

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

75.10%

99.4th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by May 3, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Progress	Sitefinity	< 10.0.6412.0
Telerik	Ui For Asp.Net Ajax	<= 2017.2.503

References

http://www.securityfocus.com/bid/99965Broken Link, Third Party Advisory, VDB Entry
http://www.telerik.com/blogs/security-alert-for-telerik-ui-for-asp.net-ajax-and-progress-sitefinityVendor Advisory
http://www.telerik.com/support/kb/aspnet-ajax/details/cryptographic-weaknessMitigation, Vendor Advisory
https://www.exploit-db.com/exploits/43873/Exploit, Third Party Advisory, VDB Entry
http://www.securityfocus.com/bid/99965Broken Link, Third Party Advisory, VDB Entry
http://www.telerik.com/blogs/security-alert-for-telerik-ui-for-asp.net-ajax-and-progress-sitefinityVendor Advisory
http://www.telerik.com/support/kb/aspnet-ajax/details/cryptographic-weaknessMitigation, Vendor Advisory
https://www.exploit-db.com/exploits/43873/Exploit, Third Party Advisory, VDB Entry
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-9248US Government Resource

Timeline

Published: Jul 3, 2017
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2017-9248?

How severe is CVE-2017-9248?

CVE-2017-9248 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 75.10% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2017-9248?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST