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CVE-2019-18935

Published: Dec 11, 2019Updated: Nov 7, 2025 Sources: CVE List NVD BDU csafCWE-502
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
99.7%
Top 0.0%
CISA KEV
Active Exploitation
Since Nov 3, 2021
Exploits
3 Known
Remediation
Patch Available
Am I actually vulnerable?1 Nuclei template available — see how to check your systems. How to verify

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-502

Affected Products

n/an/a
Telerik UITelerik AD
Mixed
OSS Libraries / web-framework
ui for asp.net ajaxtelerik
Library
DevTools & CI
telerik adcommercialOSS Librariesaka telerik ui, sitefinity
telerikcommercialDevTools & CI

Attack Graph

Products CVE Techniques Tactics

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Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Nov 3, 2021
Remediation due:May 3, 2022
Ransomware:Known ransomware use

Required action: Apply updates per vendor instructions.

3 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

3 techniques
Execution
Initial Access
View detailed technique mapping

References

https://www.telerik.com/support/whats-new/release-history
telerik.com
https://codewhitesec.blogspot.com/2019/02/telerik-revisited.html
codewhitesec.blogspot.com
https://www.telerik.com/support/kb/aspnet-ajax/details/allows-javascriptserializer-deserialization
telerik.com
and 25 more references View all →

Timeline

Published
Dec 11, 2019
Added to CISA KEV
Nov 3, 2021
Last Updated
Nov 7, 2025

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