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CRITICAL · CVSS 9.8 CISA Known Exploited Vulnerability

CVE-2017-11357

Telerik UI for ASP.NET AJAX Insecure Direct Object Reference Vulnerability

Telerik User Interface (UI) for ASP.NET AJAX

Progress Telerik UI for ASP.NET AJAX before R2 2017 SP2 does not properly restrict user input to RadAsyncUpload, which allows remote attackers to perform arbitrary file uploads or execute arbitrary code.

CVSS
9.8
CRITICAL
EPSS
77.7%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
23 Aug 2017
CWE-434

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 26 January 2023. US federal agencies were required to remediate it by 16 February 2023. CISA records this vulnerability as known to be used in ransomware campaigns.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 77.7%, which is higher than 99.6% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Frequently asked questions

Is CVE-2017-11357 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2017-11357.

What does CVE-2017-11357 affect?

CVE-2017-11357 affects Telerik User Interface (UI) for ASP.NET AJAX. Progress Telerik UI for ASP.NET AJAX before R2 2017 SP2 does not properly restrict user input to RadAsyncUpload, which allows remote attackers to perform arbitrary file uploads or execute arbitrary code.

How severe is CVE-2017-11357?

CVE-2017-11357 is rated CRITICAL with a CVSS base score of 9.8. EPSS puts the probability of exploitation in the next 30 days at 77.7%, higher than 99.6% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 16 February 2023.

How should organisations respond to CVE-2017-11357?

Apply the vendor patch for Telerik User Interface (UI) for ASP.NET AJAX as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.