How severe is CVE-2017-9248?

CVE-2017-9248 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2017-9248?

Affected package information for CVE-2017-9248 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2017-9248?

No fixed version has been published for CVE-2017-9248 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2017-9248 actively exploited in the wild?

Yes. There are 9 known exploit references for CVE-2017-9248, including 1 documented proof-of-concept exploit on Exploit-DB and 5 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2017-9248?

CVE-2017-9248 has an EPSS (Exploit Prediction Scoring System) score of 89.4%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2017-9248 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2017-9248 (Progress Telerik UI for ASP.NET AJAX and Sitefinity Cryptographic Weakness Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2021-11-03. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-05-03. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2017-9248?

CVE-2017-9248 is classified as CWE-522 (CWE-522). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2017-9248?

CVE-2017-9248 affects progress sitefinity; telerik ui for asp.net ajax. Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2017-9248 published, and has it been updated?

CVE-2017-9248 was published on July 3, 2017 and was last updated on April 21, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2021-11-03 — agencies required to remediate by 2022-05-03

CVE-2017-9248

CRITICAL

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…

Published

Jul 3, 2017

Updated

Apr 21, 2026

Affected

0 pkgs

Patched

None yet

Exploits

9 known

EPSS Exploitation Probability

via FIRST.org ↗

89.4%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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.

Affected Products

2 products · 2 configurations

Application

sitefinityprogress

< 10.0.6412.0

range

Application

ui for asp.net ajaxtelerik

≤ 2017.2.503

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-43873webappsaspx

Telerik UI for ASP.NET AJAX 2012.3.1308 < 2017.1.118 - Encryption Keys Disclosure

by Paul Taylor · Jan 24, 2018

Exploit-DB Source

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2017-9248 in your stack?

O3 detects CVE-2017-9248 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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