Security readout for executives and security teams
This flaw affects older Telerik UI for ASP.NET AJAX and Progress Sitefinity deployments. It can let an unauthenticated remote attacker undermine encryption protections and potentially expose sensitive keys, enabling serious follow-on impact such as file access, upload abuse, XSS, or ViewState compromise. Highest exposure is internet-facing ASP.NET applications using Telerik.Web.UI.dll from affected Telerik UI for ASP.NET AJAX or Sitefinity versions. Internal applications still matter if reachable by untrusted users or compromised hosts. Handle as urgent if any affected Telerik or Sitefinity component is reachable from the internet. The issue is critical, unauthenticated, and KEV-listed, with potential compromise of application trust mechanisms and data integrity. Mitigation focus: Upgrade Telerik UI for ASP.NET AJAX to R2 2017 SP1 or later.; Upgrade Progress Sitefinity to 10.0.6412.0 or later.; Check Telerik and Progress guidance for required key rotation steps..
Michael Williams reviewed this cited source version on .
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-522: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2017-9248 mapping review
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Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
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CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 43873CVE reference · exploit, x_refsource_EXPLOIT-DB
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-9248CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Insufficiently Protected Credentials
Insufficiently Protected Credentials represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.