CVE-2019-18935
Progress Telerik UI for ASP.NET AJAX through 2019.3.1023 contains a .NET deserialization...
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.)
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.)
- Record
CVE-2019-18935- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-502
- Updated
- 2026-11-02
CVE List
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.)
- Record
CVE-2019-18935- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-502
- Updated
- 2026-11-02
EUVDEUVD-2019-8608
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.)
- Record
EUVD-2019-8608- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-c655-3j45-33xw
9.8
Progress Telerik UI for ASP.NET AJAX through 2019.3.1023 contains a .NET deserialization...
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. (In 2019.3.1023 but not earlier versions, a non-default setting can prevent exploitation.)
- Record
GHSA-c655-3j45-33xw- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-502
- Updated
- 2026-11-02
CISA KEV No score
Progress Telerik UI for ASP.NET AJAX Deserialization of Untrusted Data Vulnerability
Progress Telerik UI for ASP.NET AJAX contains a deserialization of untrusted data vulnerability through RadAsyncUpload which leads to code execution on the server in the context of the w3wp.exe process.
- Record
CVE-2019-18935- Weakness
- CWE-502
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | bao7uo/RAU_crypto | 2018-01-09 |
| Metasploit | Telerik UI ASP.NET AJAX RadAsyncUpload Deserialization | 2019-12-09 |
| PoC in GitHub | noperator/CVE-2019-18935 | 2019-12-12 |
| Exploit-DB | Telerik UI - Remote Code Execution via Insecure Deserialization | 2019-12-18 |
| PoC in GitHub | becrevex/Telerik_CVE-2019-18935 | 2020-05-17 |
| PoC in GitHub | ThanHuuTuan/Telerik_CVE-2019-18935 | 2020-05-25 |
| PoC in GitHub | ThanHuuTuan/CVE_2019_18935 | 2020-05-29 |
| PoC in GitHub | murataydemir/CVE-2019-18935 | 2020-08-19 |
| PoC in GitHub | appliedi/Telerik_CVE-2019-18935 | 2020-08-26 |
| PoC in GitHub | random-robbie/CVE-2019-18935 | 2020-09-30 |
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| Source | Link | Date |
|---|---|---|
| PoC in GitHub | 0xAgun/CVE-2019-18935-checker | 2021-10-29 |
| PoC in GitHub | KasunPriyashan/Telerik-UI-ASP.NET-AJAX-Exploitation | 2022-10-13 |
| PoC in GitHub | dust-life/CVE-2019-18935-memShell | 2023-12-25 |
| PoC in GitHub | clarkvoss/telerik | 2025-03-01 |
| PoC in GitHub | ekkoo-z/CVE-2019-18935-bypasswaf | 2025-07-09 |
| PoC in GitHub | 0xsharz/telerik-scanner-CVE-2019-18935 | 2025-08-22 |
| PoC in GitHub | quyt0/CVE-2019-18935-exploit-study | 2025-09-11 |
| PoC in GitHub | menashe12346/CVE-2019-18935 | 2025-10-23 |
| PoC in GitHub | alanbarret/CVE-2019-18935 | 2025-12-08 |
History
| Recorded | Changed | Sources |
|---|---|---|
| exploitation, exploits | ||
| first indexed | CVE List, EUVD, Exploit-DB, GitHub Advisories, CISA KEV, Metasploit, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2019-18935 is a critical vulnerability (CVSS 9.8) in Progress Telerik Ui For Asp.net Ajax, published December 11, 2019. CISA lists it as known to be exploited, since November 3, 2021. EUVD reports exploitation since November 3, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 99.7%, the 99th percentile. No source names a fixed version.
References
telerik.com/support/whats-new/release-history
codewhitesec.blogspot.com/2019/02/telerik-revisited.html
telerik.com/support/kb/aspnet-ajax/details/allows-javascriptserializer-deserialization
github.com/bao7uo/RAU_crypto
know.bishopfox.com/research/cve-2019-18935-remote-code-execution-in-telerik-ui
github.com/noperator/CVE-2019-18935
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packetstormsecurity.com/files/155720/Telerik-UI-Remote-Code-Execution.html
telerik.com/support/whats-new/aspnet-ajax/release-history/ui-for-asp-net-ajax-r1-2020-%28version-2020-1-114%29
packetstormsecurity.com/files/159653/Telerik-UI-ASP.NET-AJAX-RadAsyncUpload-Deserialization.html
bleepingcomputer.com/news/security/us-federal-agency-hacked-using-old-telerik-bug-to-steal-data
cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-18935
nvd.nist.gov/vuln/detail/CVE-2019-18935
telerik.com/support/whats-new/aspnet-ajax/release-history/ui-for-asp-net-ajax-r1-2020-(version-2020-1-114)
github.com/advisories/GHSA-c655-3j45-33xw