Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 83.5%; technical severity is CVSS 9.8.
Telerik.Web.UI in Progress Telerik UI for ASP.NET AJAX before R1 2017 and R2 before R2 2017 SP2 uses weak RadAsyncUpload encryption, which allows remote attackers to perform arbitrary file uploads or execute arbitrary code.
Who should care
- Teams operating Ui For Asp.net Ajax, User Interface (UI) for ASP.NET AJAX
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether Ui For Asp.net Ajax, User Interface (UI) for ASP.NET AJAX is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Apply updates per vendor instructions.
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Verification noteAutomated link verification has not completed for this guidance yet.
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-326
- Affected versions
- Telerik Ui For Asp.net Ajax (End Including 2016.3.1027 | Version 2017.2.503 | Version 2017.2.621); Telerik User Interface (UI) for ASP.NET AJAX
- Fixed versions
- No explicit fixed version is currently recorded.
- Published
- 23 August 2017
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 83.5%
- Signal calculated at 83