# 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 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.)

- Page: https://www.vulneraibility.com/cve/CVE-2019-18935
- CVSS: 9.8
- Known exploited: yes, in CISA KEV since 2021-11-03; CISA due date 2022-05-03; known ransomware use
- EPSS: 99.74% (percentile 100.0)
- Public exploit code: 1 on Exploit-DB · 1 Metasploit module · 17 GitHub proofs of concept (first 2019-12-12)
- CISA SSVC: exploitation active, automatable yes, technical impact total (assessed 2025-02-04)
- Weakness: CWE-502
- Published: 2019-12-11

## Affected

- telerik:ui_for_asp.net_ajax

## References

- [other] https://www.telerik.com/support/whats-new/release-history
- [other] https://codewhitesec.blogspot.com/2019/02/telerik-revisited.html
- [other] https://www.telerik.com/support/kb/aspnet-ajax/details/allows-javascriptserializer-deserialization
- [other] https://github.com/bao7uo/RAU_crypto
- [other] https://know.bishopfox.com/research/cve-2019-18935-remote-code-execution-in-telerik-ui
- [other] https://github.com/noperator/CVE-2019-18935
- [other] http://packetstormsecurity.com/files/155720/Telerik-UI-Remote-Code-Execution.html
- [other] https://www.telerik.com/support/whats-new/aspnet-ajax/release-history/ui-for-asp-net-ajax-r1-2020-%28version-2020-1-114%29
- [other] http://packetstormsecurity.com/files/159653/Telerik-UI-ASP.NET-AJAX-RadAsyncUpload-Deserialization.html
- [other] https://www.bleepingcomputer.com/news/security/us-federal-agency-hacked-using-old-telerik-bug-to-steal-data/
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-18935

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.