CVE-2019-18935
Progress Telerik UI for ASP.NET AJAX Deserialization of Untrusted Data Vulnerability - [Actively Exploited]
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.)
INFO
Published Date :
Dec. 11, 2019, 1:15 p.m.
Last Modified :
March 14, 2025, 5:38 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
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.
Apply updates per vendor instructions.
https://nvd.nist.gov/vuln/detail/CVE-2019-18935
Affected Products
The following products are affected by CVE-2019-18935
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | HIGH | [email protected] | ||||
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 3.1 | CRITICAL | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Upgrade to Telerik UI for ASP.NET AJAX version R3 2019 SP1 (2019.3.1023) or later, and enable the type whitelisting feature of RadAsyncUpload.
Public PoC/Exploit Available at Github
CVE-2019-18935 has a 76 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2019-18935.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2019-18935 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2019-18935
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Telerik CVE-2019-18935 Vulnerability Scanner
Python
A simulated penetration testing report of a web application based on the OWASP Top 10, identifying and analyzing real-world vulnerabilities using tools like Burp Suite, Nmap, and more.
None
Python
A daily-updated blocklist of IP addresses involved in malicious HTTP attacks that bypassed multiple security layers. Ideal for protecting web servers against probing, exploits, and bot traffic.
blocklist cybersecurity firewall security threat-intelligence malware
My version of external attack surface management.
Dockerfile Shell TypeScript
None
An evolving how-to guide for securing a Linux server.
Shell
CVE-2019-18935: Remote Code Execution
Python
This is my starred repositories including the description for each tool. Makes search/filter over them easier.
None
HTML Python Shell
TelerikUI Vulnerability Scanner
telerik-ui vulnerability vulnerability-scanners cve-2019-18935 telerik-vuln
C#
In network security AI Using machine learning and data analytics, AI systems can recognize signs of hacking, data breaches, and malware infections and provide real-time alerts
自动搜集每天的漏洞poc和exp信息。
My exam notes for OSWE
offensive-security
Crowdsec Blacklist mirror - allows you to create a local HTTP service with an up-to-date list of harmful IP addresses
blocklist crowdsec docker docker-compose firewall security
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2019-18935 vulnerability anywhere in the article.
-
CybersecurityNews
Qilin Ransomware Leads The Attack Landscape With 70+ Claimed Victims in July
The ransomware threat landscape witnessed a concerning surge in July 2025, with the Qilin ransomware group maintaining its dominant position for the third time in four months. The group successfully c ... Read more
-
The Hacker News
XE Hacker Group Exploits VeraCore Zero-Day to Deploy Persistent Web Shells
Threat actors have been observed exploiting multiple security flaws in various software products, including Progress Telerik UI for ASP.NET AJAX and Advantive VeraCore, to drop reverse shells and web ... Read more
-
AttackIQ
Response to CISA Advisory (AA24-317A): 2023 Top Routinely Exploited Vulnerabilities
On November 12, 2024, the U.S. Cybersecurity & Infrastructure Security Agency (CISA) released a Cybersecurity Advisory (CSA) providing details on the Common Vulnerabilities and Exposures (CVEs) routin ... Read more
-
security.nl
VS publiceert overzicht van meest misbruikte kwetsbaarheden in 2023
De Amerikaanse autoriteiten hebben samen met cyberagentschappen uit Australië, Canada, Nieuw-Zeeland en het Verenigd Koninkrijk een overzicht van de meest misbruikte kwetsbaarheden in 2023 opgesteld. ... Read more
-
Cybersecurity News
Silent Skimmer Reemerges: New Tactics Target Payment Gateways
Unit 42 researchers have detected renewed activity from a notorious financially motivated threat actor known as Silent Skimmer. This cybercriminal group, first identified in 2023, had seemingly faded ... Read more
The following table lists the changes that have been made to the
CVE-2019-18935 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Modified Analysis by [email protected]
Mar. 14, 2025
Action Type Old Value New Value -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Feb. 04, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-502 -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference http://packetstormsecurity.com/files/155720/Telerik-UI-Remote-Code-Execution.html Added Reference http://packetstormsecurity.com/files/159653/Telerik-UI-ASP.NET-AJAX-RadAsyncUpload-Deserialization.html Added Reference https://codewhitesec.blogspot.com/2019/02/telerik-revisited.html Added Reference https://github.com/bao7uo/RAU_crypto Added Reference https://github.com/noperator/CVE-2019-18935 Added Reference https://know.bishopfox.com/research/cve-2019-18935-remote-code-execution-in-telerik-ui Added Reference https://www.bleepingcomputer.com/news/security/us-federal-agency-hacked-using-old-telerik-bug-to-steal-data/ Added Reference https://www.telerik.com/support/kb/aspnet-ajax/details/allows-javascriptserializer-deserialization Added Reference https://www.telerik.com/support/whats-new/aspnet-ajax/release-history/ui-for-asp-net-ajax-r1-2020-%28version-2020-1-114%29 Added Reference https://www.telerik.com/support/whats-new/release-history -
Modified Analysis by [email protected]
Jul. 25, 2024
Action Type Old Value New Value Changed Reference Type http://packetstormsecurity.com/files/155720/Telerik-UI-Remote-Code-Execution.html Third Party Advisory http://packetstormsecurity.com/files/155720/Telerik-UI-Remote-Code-Execution.html Third Party Advisory, VDB Entry Changed Reference Type http://packetstormsecurity.com/files/159653/Telerik-UI-ASP.NET-AJAX-RadAsyncUpload-Deserialization.html No Types Assigned http://packetstormsecurity.com/files/159653/Telerik-UI-ASP.NET-AJAX-RadAsyncUpload-Deserialization.html Exploit, Third Party Advisory, VDB Entry Changed Reference Type https://github.com/noperator/CVE-2019-18935 Third Party Advisory https://github.com/noperator/CVE-2019-18935 Exploit, Third Party Advisory Changed Reference Type https://www.bleepingcomputer.com/news/security/us-federal-agency-hacked-using-old-telerik-bug-to-steal-data/ No Types Assigned https://www.bleepingcomputer.com/news/security/us-federal-agency-hacked-using-old-telerik-bug-to-steal-data/ Press/Media Coverage Changed Reference Type https://www.telerik.com/support/whats-new/aspnet-ajax/release-history/ui-for-asp-net-ajax-r1-2020-%28version-2020-1-114%29 No Types Assigned https://www.telerik.com/support/whats-new/aspnet-ajax/release-history/ui-for-asp-net-ajax-r1-2020-%28version-2020-1-114%29 Release Notes Changed CPE Configuration OR *cpe:2.3:a:telerik:ui_for_asp.net_ajax:*:*:*:*:*:*:*:* versions from (including) 2011.1.315 up to (excluding) 2019.3.1023 OR *cpe:2.3:a:telerik:ui_for_asp.net_ajax:*:*:*:*:*:*:*:* versions from (including) 2011.1.315 up to (including) 2020.1.114 -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Added Reference MITRE https://www.telerik.com/support/whats-new/aspnet-ajax/release-history/ui-for-asp-net-ajax-r1-2020-%28version-2020-1-114%29 [No types assigned] Removed Reference MITRE https://www.telerik.com/support/whats-new/aspnet-ajax/release-history/ui-for-asp-net-ajax-r1-2020-(version-2020-1-114) -
CVE Modified by [email protected]
Mar. 15, 2023
Action Type Old Value New Value Added Reference https://www.bleepingcomputer.com/news/security/us-federal-agency-hacked-using-old-telerik-bug-to-steal-data/ [No Types Assigned] -
CVE Modified by [email protected]
Oct. 20, 2020
Action Type Old Value New Value Added Reference http://packetstormsecurity.com/files/159653/Telerik-UI-ASP.NET-AJAX-RadAsyncUpload-Deserialization.html [No Types Assigned] -
CVE Modified by [email protected]
Jan. 16, 2020
Action Type Old Value New Value Added Reference https://www.telerik.com/support/whats-new/aspnet-ajax/release-history/ui-for-asp-net-ajax-r1-2020-(version-2020-1-114) [No Types Assigned] -
Initial Analysis by [email protected]
Dec. 19, 2019
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type http://packetstormsecurity.com/files/155720/Telerik-UI-Remote-Code-Execution.html No Types Assigned http://packetstormsecurity.com/files/155720/Telerik-UI-Remote-Code-Execution.html Third Party Advisory Changed Reference Type https://codewhitesec.blogspot.com/2019/02/telerik-revisited.html No Types Assigned https://codewhitesec.blogspot.com/2019/02/telerik-revisited.html Not Applicable Changed Reference Type https://github.com/bao7uo/RAU_crypto No Types Assigned https://github.com/bao7uo/RAU_crypto Exploit, Third Party Advisory Changed Reference Type https://github.com/noperator/CVE-2019-18935 No Types Assigned https://github.com/noperator/CVE-2019-18935 Third Party Advisory Changed Reference Type https://know.bishopfox.com/research/cve-2019-18935-remote-code-execution-in-telerik-ui No Types Assigned https://know.bishopfox.com/research/cve-2019-18935-remote-code-execution-in-telerik-ui Exploit, Third Party Advisory Changed Reference Type https://www.telerik.com/support/kb/aspnet-ajax/details/allows-javascriptserializer-deserialization No Types Assigned https://www.telerik.com/support/kb/aspnet-ajax/details/allows-javascriptserializer-deserialization Patch, Vendor Advisory Changed Reference Type https://www.telerik.com/support/whats-new/release-history No Types Assigned https://www.telerik.com/support/whats-new/release-history Release Notes, Vendor Advisory Added CWE NIST CWE-502 Added CPE Configuration OR *cpe:2.3:a:telerik:ui_for_asp.net_ajax:*:*:*:*:*:*:*:* versions from (including) 2011.1.315 up to (excluding) 2019.3.1023 -
CVE Modified by [email protected]
Dec. 18, 2019
Action Type Old Value New Value Added Reference http://packetstormsecurity.com/files/155720/Telerik-UI-Remote-Code-Execution.html [No Types Assigned] -
CVE Modified by [email protected]
Dec. 17, 2019
Action Type Old Value New Value Added Reference https://know.bishopfox.com/research/cve-2019-18935-remote-code-execution-in-telerik-ui [No Types Assigned] Added Reference https://github.com/noperator/CVE-2019-18935 [No Types Assigned]
Vulnerability Scoring Details
Base CVSS Score: 9.8
Base CVSS Score: 7.5
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
93.66 }} 0.19%
score
0.99837
percentile