What is CVE-2017-9248?

CVE-2017-9248 is a critical-severity vulnerability in Progress Sitefinity, classified under Insufficiently Protected Credentials. CVSS score: 9.8/10. Published 2017-07-03.

How severe is CVE-2017-9248?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2017-9248 known to be exploited?

Yes. CVE-2017-9248 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 45 public proof-of-concept repositories are indexed.

Vulnerability in Progress Sitefinity

CVE-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 mechanisms, leading to a MachineKey leak, arbitrary file uploads or downloads, XSS, or ASP.NET ViewState compromise.

Published 2017-07-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.751 (99.5th percentile), scored 2026-10-19.

High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.751 · newest: 0.751 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-522 — Insufficiently Protected Credentials

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2021-11-03. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-05-03.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

www.telerik.com/support/kb/aspnet-ajax/details/cryptographic-weakness (Mitigation, Vendor Advisory)
www.exploit-db.com/exploits/43873/ (Exploit, VDB Entry, Third Party Advisory, exploit)
www.telerik.com/blogs/security-alert-for-telerik-ui-for-asp.net-ajax-and-progre… (Vendor Advisory)
www.securityfocus.com/bid/99965 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2017-9248?: CVE-2017-9248 is a critical-severity vulnerability in Progress Sitefinity, classified under Insufficiently Protected Credentials. CVSS score: 9.8/10. Published 2017-07-03.
How severe is CVE-2017-9248?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2017-9248 known to be exploited?: Yes. CVE-2017-9248 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 45 public proof-of-concept repositories are indexed.