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CVE-2021-21800 : What You Need to Know

Learn about CVE-2021-21800, a critical Cross-site scripting vulnerability in Advantech R-SeeNet 2.4.12, allowing attackers to execute arbitrary JavaScript code.

This article provides detailed information about CVE-2021-21800, a critical Cross-site scripting vulnerability in Advantech R-SeeNet 2.4.12.

Understanding CVE-2021-21800

CVE-2021-21800 is a high-risk vulnerability affecting Advantech R-SeeNet v 2.4.12 (20.10.2020), allowing attackers to execute arbitrary JavaScript code in a victim's browser.

What is CVE-2021-21800?

A Cross-site scripting vulnerability in ssh_form.php script of Advantech R-SeeNet leads to arbitrary code execution when a user accesses a specially crafted URL.

The Impact of CVE-2021-21800

The vulnerability has a CVSS base score of 9.6, making it critical. Attackers can exploit it to compromise confidentiality, integrity, and availability of the targeted system.

Technical Details of CVE-2021-21800

The technical aspects of this vulnerability include:

Vulnerability Description

Cross-site scripting flaw in ssh_form.php script allows attackers to trigger arbitrary JavaScript code execution through a crafted URL.

Affected Systems and Versions

Advantech R-SeeNet 2.4.12 (20.10.2020) is confirmed to be vulnerable to this issue.

Exploitation Mechanism

By enticing a user to click on a malicious URL, an attacker can exploit this vulnerability to execute arbitrary code within the user's browser.

Mitigation and Prevention

To mitigate the risk associated with CVE-2021-21800, follow these steps:

Immediate Steps to Take

        Apply security patches provided by Advantech promptly.
        Educate users about avoiding clicking on suspicious URLs.

Long-Term Security Practices

        Implement web application security best practices to prevent Cross-site scripting attacks.

Patching and Updates

Regularly monitor for security updates from Advantech and apply patches as soon as they are released.

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