CVE-2019-18935
Progress Telerik UI for ASP.NET AJAX through 2019.3.1023 contains a .NET deserialization vulnerability in the RadAsyncUpload function. This is…
Browse: All 2019 CVEs · All vendors
- CVSS score
- 9.8 Critical
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- CISA KEV
- Yes — actively exploited (added 2021-11-03, remediation due 2022-05-03)
- Ransomware
- Known ransomware campaign use
- Weakness (CWE)
- CWE-502
- Published
- 2019-12-11
- Last modified
- 2026-06-17
- NVD status
- Analyzed
Description
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.)
Affected products
- telerik ui for asp.net ajax
Affected ranges per NVD CPE data; confirm exact versions in the vendor advisory.
Required action (CISA)
Apply updates per vendor instructions. Federal remediation deadline: 2022-05-03.
How to prioritize this
This vulnerability is on the CISA KEV list, meaning it is being actively exploited — treat it as urgent regardless of the raw CVSS number. Use the live CVE lookup for the latest NVD data, and the CVSS 3.1 calculator to model your own environmental score. For the actively exploited vulnerabilities that matter this week, read The Exploit HQ daily security brief.
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
FAQ
Is CVE-2019-18935 actively exploited?
Yes. CISA added CVE-2019-18935 to its Known Exploited Vulnerabilities (KEV) catalog on 2021-11-03, with a federal remediation deadline of 2022-05-03. A KEV listing means real-world exploitation is confirmed, so patching this should be prioritized above many higher-CVSS bugs that aren't being exploited.
What is the CVSS score of CVE-2019-18935?
CVE-2019-18935 has a CVSS base score of 9.8 (Critical). Its vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Related vulnerabilities
- CVE-2026-8037 — Progress LoadMaster
- CVE-2024-4885 — Progress WhatsUp Gold
- CVE-2024-1212 — Progress Kemp LoadMaster
- CVE-2024-6670 — Progress WhatsUp Gold
- CVE-2024-4358 — Progress Telerik Report Server
- CVE-2023-40044 — Progress WS_FTP Server
Data source: NVD & CISA KEV. Shown as-is; nothing added. Last generated from NVD data — re-check the live tool for updates.
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