Is CVE-2021-28821 actively exploited?

No active exploitation of CVE-2021-28821 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-28821 be exploited remotely?

No. CVE-2021-28821 requires local access to exploit.

What is the CVSS score of CVE-2021-28821?

CVE-2021-28821 has a CVSS score of 7.8 (HIGH).

HOME VULNERABILITIESCVE-2021-28821

HIGH

CVE-2021-28821

CWE-863Published: March 23, 2021· Updated: Jun 17, 2026

7.8

CVSS v3.1

Official Description

The Windows Installation component of TIBCO Software Inc.'s TIBCO Enterprise Message Service, TIBCO Enterprise Message Service - Community Edition, and TIBCO Enterprise Message Service - Developer Edition contains a vulnerability that theoretically allows a low privileged attacker with local access on some versions of the Windows operating system to insert malicious software. The affected component can be abused to execute the malicious software inserted by the attacker with the elevated privileges of the component. This vulnerability results from a lack of access restrictions on certain files and/or folders in the installation. Affected releases are TIBCO Software Inc.'s TIBCO Enterprise Message Service: versions 8.5.1 and below, TIBCO Enterprise Message Service - Community Edition: versions 8.5.1 and below, and TIBCO Enterprise Message Service - Developer Edition: versions 8.5.1 and below.

NVD Source

Technical Analysis

CVE-2021-28821 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

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 7.8.