CVE-2019-18935Progress Telerik UI for ASP.NET AJAX through 2019.3.1023 contains a .NET deserialization vulnerability in the RadAsyncUpload function.
Updated under an hour ago ()
Does this affect you?
It affects telerik ui_for_asp.net_ajax. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Nov 3, 2021; federal agencies had to remediate by May 3, 2022, and it is known to be used in ransomware. Treat that date as your deadline.
Do this next
Free account, 1 product
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
- 9.8 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-502
- Known exploited
- Added to CISA KEV Nov 3, 2021; federal remediation due May 3, 2022; known ransomware useApply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 99.74% (percentile 100)
- Assigned by
- mitre
- NVD analysis
- Analyzed
- Record last updated
- Oct 21, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
telerik ui_for_asp.net_ajax telerik:ui_for_asp.net_ajax | from 2011.1.315 through 2020.1.114 | NVD |
References
- https://www.telerik.com/support/whats-new/release-historyrelease-notes, vendor-advisory
- https://codewhitesec.blogspot.com/2019/02/telerik-revisited.htmlnot-applicable
- https://www.telerik.com/support/kb/aspnet-ajax/details/allows-javascriptserializer-deserializationpatch, vendor-advisory
- https://github.com/bao7uo/RAU_cryptoexploit, third-party-advisory
- https://know.bishopfox.com/research/cve-2019-18935-remote-code-execution-in-telerik-uiexploit, third-party-advisory
- https://github.com/noperator/CVE-2019-18935exploit, third-party-advisory
- http://packetstormsecurity.com/files/155720/Telerik-UI-Remote-Code-Execution.htmlthird-party-advisory, vdb-entry
- https://www.telerik.com/support/whats-new/aspnet-ajax/release-history/ui-for-asp-net-ajax-r1-2020-%28version-2020-1-114%29release-notes
- http://packetstormsecurity.com/files/159653/Telerik-UI-ASP.NET-AJAX-RadAsyncUpload-Deserialization.htmlexploit, third-party-advisory, vdb-entry
- https://www.bleepingcomputer.com/news/security/us-federal-agency-hacked-using-old-telerik-bug-to-steal-data/press/media-coverage
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-18935us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.