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CVE-2017-9248

CRITICAL
9.8
CVSS Score
Published: July 3, 2017 at 07:00 PM UTC
Updated: June 17, 2026 at 01:27 AM UTC
2 products affected across 2 vendorsSitefinityUI for Asp.net Ajax

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Severity
CRITICAL9.8
Exploitation
CISA KEV
Exploit prediction
EPSS 75%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score75.1%

EPSS (Exploit Prediction Scoring System) estimates a 75.1% chance this CVE is exploited in the wild within the next 30 days — higher than 100% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Progress Telerik UI for ASP.NET AJAX and Sitefinity have a cryptographic weakness in Telerik.Web.UI.dll that can be exploited to disclose encryption keys (Telerik.Web.UI.DialogParametersEncryptionKey and/or the MachineKey), perform cross-site-scripting (XSS) attacks, compromise the ASP.NET ViewState, and/or upload and download files.

Required Action
Apply updates per vendor instructions.
Ransomware Use
Unknown
Added to KEV
Nov 3, 2021
Remediation Due
May 3, 2022
1638 days overdue
Notes
https://nvd.nist.gov/vuln/detail/CVE-2017-9248

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Sitefinity· Progress
95%
v < 10.0.6412.0
Affected range stops below 10.0.6412.0, so it looks safe — our inference, not a vendor statement
UI for Asp.net Ajax· Telerik
95%
v ≤ 2017.2.503

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

VDB Entryx_refsource_BIDBroken LinkThird Party Advisory
Source: [email protected]
http://www.securityfocus.com/bid/99965
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
http://www.telerik.com/blogs/security-alert-for-telerik-ui-for-asp.net-ajax-and-progress-sitefinity
x_refsource_CONFIRMMitigationVendor Advisory
Source: [email protected]
http://www.telerik.com/support/kb/aspnet-ajax/details/cryptographic-weakness
Exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry
Source: [email protected]
https://www.exploit-db.com/exploits/43873/
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-9248

SSVC — Action Prioritization

SSVCActiveAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

9.8CRITICALCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-522

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