Is CVE-2021-28141 actively exploited?

No active exploitation of CVE-2021-28141 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-28141 be exploited remotely?

Yes. CVE-2021-28141 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-28141?

CVE-2021-28141 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-28141

CRITICAL

CVE-2021-28141

CWE-862Published: March 11, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official 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

NVD Source

Technical Analysis

CVE-2021-28141 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.