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

Source: https://junglewise.ai/threats/cve-2017-9248-progress-telerik-ui-for-asp-net-ajax-and-sitefinity-cryptographic  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-11-03. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2017-9248 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2021-11-03

Telerik.Web.UI.dll in Progress Telerik UI for ASP.NET AJAX and Sitefinity contains a cryptographic weakness that fails to properly protect encryption keys. Remote attackers can exploit this to leak the MachineKey, perform arbitrary file uploads/downloads, execute XSS attacks, or compromise the ASP.NET ViewState.

Technologies: [Progress Sitefinity](https://junglewise.ai/threats/technologies/sitefinity). Vendors: [Progress](https://junglewise.ai/threats/vendors/progress).

## Quick answers

**Is CVE-2017-9248 exploited in the wild?** Yes. CVE-2017-9248 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.

**How severe is CVE-2017-9248?** Critical severity, with a CVSS score of 9.8, published 3 November 2021.

**Which products and versions are affected?** Progress Telerik UI for ASP.NET AJAX before R2 2017 SP1 (2017.2.621); Progress Telerik Sitefinity before 10.0.6412.0.

**Is there a fix for CVE-2017-9248?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2017-9248 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2017-9248?** Check whether you run Progress Asp.Net Ajax or Progress Sitefinity. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Progress Telerik UI for ASP.NET AJAX before R2 2017 SP1 (2017.2.621)
- Progress Telerik Sitefinity before 10.0.6412.0

## Timeline

- 2017-07-03: disclosed: NVD Published Date
- 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
- 2018-01-24: other: Exploit-DB entry published (approximate based on reference date)

## Related threats

- [Progress Sitefinity insufficiently protected credentials in web services](https://junglewise.ai/threats/cve-2026-7313-progress-sitefinity-insufficiently-protected-credentials-in-web)
- [Progress Sitefinity insufficiently protected credentials in web services](https://junglewise.ai/threats/cve-2026-7312-progress-sitefinity-insufficiently-protected-credentials-in-web)
- [Progress Sitefinity authorization bypass in web services](https://junglewise.ai/threats/cve-2026-7201-progress-sitefinity-authorization-bypass-in-web-services)
- [Progress Sitefinity improper access control in web services](https://junglewise.ai/threats/cve-2026-7198-progress-sitefinity-improper-access-control-in-web-services)
- [Progress Sitefinity improper input validation in web services](https://junglewise.ai/threats/cve-2026-7195-progress-sitefinity-improper-input-validation-in-web-services)