# CVE-2017-9248: Progress Telerik UI for ASP.NET AJAX and Sitefinity Cryptographic Weakness Vulnerability

> CVE-2017-9248: Progress Telerik UI for ASP.NET AJAX and Sitefinity Cryptographic Weakness Vulnerability. CVSS 9.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2017-9248
Last updated: 2025-10-21T23:55:39Z

- Published: 2017-07-03 19:00 UTC · Updated: 2025-10-21 23:55 UTC · Assigner: mitre
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 75.1%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2022-05-03, ransomware use: Unknown

## 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.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Progress: ASP.NET AJAX and Sitefinity

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2017-9248)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2017-9248)
- [https://www.exploit-db.com/exploits/43873/](https://www.exploit-db.com/exploits/43873/)
- [http://www.securityfocus.com/bid/99965](http://www.securityfocus.com/bid/99965)
- [http://www.telerik.com/blogs/security-alert-for-telerik-ui-for-asp.net-ajax-and-progress-sitefinity](http://www.telerik.com/blogs/security-alert-for-telerik-ui-for-asp.net-ajax-and-progress-sitefinity)
- [http://www.telerik.com/support/kb/aspnet-ajax/details/cryptographic-weakness](http://www.telerik.com/support/kb/aspnet-ajax/details/cryptographic-weakness)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2017-9248 · Markdown: https://rewindex.com/cve/CVE-2017-9248.md · JSON: https://rewindex.com/api/v1/cves/CVE-2017-9248 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:44:15.845Z