Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 99.7%; technical severity is CVSS 9.8.
Progress Telerik UI for ASP.NET AJAX through 2019.3.1023 contains a .NET deserialization vulnerability in the RadAsyncUpload function. This is exploitable when the encryption keys are known due to the presence of CVE-2017-11317 or CVE-2017-11357, or other means. Exploitation can result in remote code execution. (As of 2020.1.114, a default setting prevents the exploit. In 2019.3.1023, but not earlier versions, a non-default setting can prevent exploitation.)
Who should care
- Teams operating Telerik Ui For Asp.net Ajax, Ui For Asp.net Ajax
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether Telerik Ui For Asp.net Ajax, 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.
Vendor remediation
Patch and remediation links
Use the vendor source below to confirm the correct fixed version, package or mitigation for your affected product.
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-502
- Affected versions
- Progress Telerik Ui For Asp.net Ajax; Telerik Ui For Asp.net Ajax (Start Including: 2011.1.315, End Including: 2020.1.114)
- Published
- 11 December 2019
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 99.7%
- Signal calculated at 88
External references
- Government advisory from www.cisa.gov
- Third-party advisory from packetstormsecurity.com
- Exploit information from packetstormsecurity.com
- Exploit information from github.com
- Exploit information from github.com
- Technical reference from www.bleepingcomputer.com
- Release notes from www.telerik.com
- Release notes from www.telerik.com