What’s Vulnerable › Vulnerabilities

CVE-2021-28141

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-03-11 · updated 2026-06-17
• Weakness: CWE-862

Description

An issue was discovered in Progress Telerik UI for ASP.NET AJAX 2021.1.224. It allows unauthorized access to MicrosoftAjax.js through the Telerik.Web.UI.WebResource.axd file. This may allow the attacker to gain unauthorized access to the server and execute code. To exploit, one must use the parameter _TSM_HiddenField_ and inject a command at the end of the URI. NOTE: the vendor states that this is not a vulnerability. The request's output does not indicate that a "true" command was executed on the server, and the request's output does not leak any private source code or data from the server

Affected products

• Progress Software Telerik UI for ASP.NET AJAX: 2021.1.224

References

• https://gist.github.com/shreyasfegade/e2480e26b2ed1d0c7175ecf7cb15f9c1
• https://pastebin.com/JULpfvFJ
• https://gist.github.com/shreyasfegade/e2480e26b2ed1d0c7175ecf7cb15f9c1
• https://pastebin.com/JULpfvFJ

Get alerted when CVE-2021-28141 or the next vulnerability affects your stack