CVE-2019-18935
Progress Telerik UI for ASP.NET AJAX Deserialization of Untrusted Data Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 3 May 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.)
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 99.74% probability · 100th percentile
- Public exploits
- 1 in Exploit-DB · first 18 December 2019
- CISA KEV
- Listed 3 November 2021 · due 3 May 2022 · used in ransomware campaigns
- Weakness
- CWE-502
- Affected
- telerik/ui for asp.net ajax
- Source
- cve@mitre.org
EPSS 99.7% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2019-18935
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- http://packetstormsecurity.com/files/155720/Telerik-UI-Remote-Code-Execution.htmlThird Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/159653/Telerik-UI-ASP.NET-AJAX-RadAsyncUpload-Deserialization.htmlExploit, Third Party Advisory, VDB Entry
- https://codewhitesec.blogspot.com/2019/02/telerik-revisited.htmlNot Applicable
- https://github.com/bao7uo/RAU_cryptoExploit, Third Party Advisory
- https://github.com/noperator/CVE-2019-18935Exploit, Third Party Advisory
- https://know.bishopfox.com/research/cve-2019-18935-remote-code-execution-in-telerik-uiExploit, Third Party Advisory
- https://www.bleepingcomputer.com/news/security/us-federal-agency-hacked-using-old-telerik-bug-to-steal-data/Press/Media Coverage
- https://www.telerik.com/support/kb/aspnet-ajax/details/allows-javascriptserializer-deserializationPatch, Vendor Advisory
- https://www.telerik.com/support/whats-new/aspnet-ajax/release-history/ui-for-asp-net-ajax-r1-2020-%28version-2020-1-114%29Release Notes
- https://www.telerik.com/support/whats-new/release-historyRelease Notes, Vendor Advisory
- http://packetstormsecurity.com/files/155720/Telerik-UI-Remote-Code-Execution.htmlThird Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/159653/Telerik-UI-ASP.NET-AJAX-RadAsyncUpload-Deserialization.htmlExploit, Third Party Advisory, VDB Entry
- https://codewhitesec.blogspot.com/2019/02/telerik-revisited.htmlNot Applicable
- https://github.com/bao7uo/RAU_cryptoExploit, Third Party Advisory
- https://github.com/noperator/CVE-2019-18935Exploit, Third Party Advisory
- https://know.bishopfox.com/research/cve-2019-18935-remote-code-execution-in-telerik-uiExploit, Third Party Advisory
- https://www.bleepingcomputer.com/news/security/us-federal-agency-hacked-using-old-telerik-bug-to-steal-data/Press/Media Coverage
- https://www.telerik.com/support/kb/aspnet-ajax/details/allows-javascriptserializer-deserializationPatch, Vendor Advisory
- https://www.telerik.com/support/whats-new/aspnet-ajax/release-history/ui-for-asp-net-ajax-r1-2020-%28version-2020-1-114%29Release Notes
- https://www.telerik.com/support/whats-new/release-historyRelease Notes, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-18935US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.