CVE-2021-27659 : Exploit Details and Defense Strategies

A detailed article outlining the CVE-2021-27659 vulnerability affecting the exacqVision Web Service by Johnson Controls.

Understanding CVE-2021-27659

This vulnerability impacts exacqVision Web Service by allowing user-controllable input to be placed in web pages without proper validation.

What is CVE-2021-27659?

CVE-2021-27659 is a Cross-site Scripting (XSS) vulnerability in exacqVision Web Service versions up to and including 21.03, enabling attackers to execute malicious scripts on other users' web browsers.

The Impact of CVE-2021-27659

The vulnerability has a CVSS base score of 5.3 (Medium severity) with low integrity impact, affecting the confidentiality and availability of user data.

Technical Details of CVE-2021-27659

A closer look at the vulnerability highlights specific details.

Vulnerability Description

exacqVision Web Service 21.03 fails to adequately validate, escape, or encode user-controlled input, posing a risk of XSS attacks.

Affected Systems and Versions

All versions of exacqVision Web Service up to and including 21.03 are vulnerable to this security flaw.

Exploitation Mechanism

Attackers can exploit this vulnerability to inject and execute malicious scripts through the web application, compromising user data and system integrity.

Mitigation and Prevention

Understanding how to mitigate and prevent exploitation of CVE-2021-27659 is crucial.

Immediate Steps to Take

Users are advised to upgrade to the latest version of exacqVision Web Service, specifically version 21.06, to address this vulnerability.

Long-Term Security Practices

Implement thorough input validation and output encoding practices to prevent XSS attacks and ensure web application security.

Patching and Updates

Current users can download the critical software update from the official Software Downloads website.