Is CVE-2021-40191 actively exploited?

No active exploitation of CVE-2021-40191 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-40191 be exploited remotely?

Yes. CVE-2021-40191 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-40191?

CVE-2021-40191 has a CVSS score of 5.4 (MEDIUM).

HOME VULNERABILITIESCVE-2021-40191

MEDIUM

CVE-2021-40191

CWE-79Published: October 11, 2021· Updated: Jun 17, 2026

5.4

CVSS v3.1

Official Description

Dzzoffice Version 2.02.1 is affected by cross-site scripting (XSS) due to a lack of sanitization of input data at all upload functions in webroot/dzz/attach/Uploader.class.php and return a wrong response in content-type of output data in webroot/dzz/attach/controller.php.

NVD Source

Technical Analysis

CVE-2021-40191 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

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

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.