CVE DATABASE / CVE-2019-18935
CVE-2019-18935
Progress Telerik UI for ASP.NET AJAX Deserialization of Untrusted Data Vulnerability
Confirmed exploited in the wild. Added 2021-11-03.
Federal remediation due 2022-05-03.
Required action: Apply updates per vendor instructions.
Summary
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.)
CVSS 3.1 breakdown
| Base score | 9.8 (CRITICAL) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| Attack vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity | HIGH |
| Availability | HIGH |
Weakness type (CWE)
Affected products
Use our free CVE Lookup tool for the latest NVD record, or browse the full CISA KEV catalog.
References
- http://packetstormsecurity.com/files/155720/Telerik-UI-Remote-Code-Execution.html
- http://packetstormsecurity.com/files/159653/Telerik-UI-ASP.NET-AJAX-RadAsyncUpload-Deserialization.html
- https://codewhitesec.blogspot.com/2019/02/telerik-revisited.html
- https://github.com/bao7uo/RAU_crypto
- https://github.com/noperator/CVE-2019-18935
- https://know.bishopfox.com/research/cve-2019-18935-remote-code-execution-in-telerik-ui
- https://www.bleepingcomputer.com/news/security/us-federal-agency-hacked-using-old-telerik-bug-to-steal-data/
- https://www.telerik.com/support/kb/aspnet-ajax/details/allows-javascriptserializer-deserialization
- https://www.telerik.com/support/whats-new/aspnet-ajax/release-history/ui-for-asp-net-ajax-r1-2020-%28version-2020-1-114%29
- https://www.telerik.com/support/whats-new/release-history
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-18935
Data: NIST NVD + CISA KEV. NVD last modified 2025-11-07. Always verify against the vendor advisory before acting.