CVE-2020-4021 Explained : Impact and Mitigation

Atlassian Jira Server and Data Center versions before 8.5.5, and from 8.6.0 before 8.8.1, are vulnerable to a Cross-Site Scripting (XSS) issue that allows remote attackers to inject arbitrary HTML or JavaScript.

Understanding CVE-2020-4021

This CVE involves a security vulnerability in Atlassian Jira Server and Data Center that could be exploited by attackers to perform XSS attacks.

What is CVE-2020-4021?

The CVE-2020-4021 vulnerability in Atlassian Jira Server and Data Center allows malicious actors to inject arbitrary HTML or JavaScript through a cross-site scripting flaw in the XML export view.

The Impact of CVE-2020-4021

This vulnerability could lead to remote attackers executing malicious scripts in the context of a user's browser, potentially compromising sensitive data or performing unauthorized actions.

Technical Details of CVE-2020-4021

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability in Atlassian Jira Server and Data Center versions before 8.5.5 and from 8.6.0 before 8.8.1 enables remote attackers to conduct XSS attacks via the XML export view.

Affected Systems and Versions

Product: Jira Server and Data Center
Vendor: Atlassian
Vulnerable Versions:
Before 8.5.5
From 8.6.0 before 8.8.1

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting malicious HTML or JavaScript code through the XML export view, potentially leading to XSS attacks.

Mitigation and Prevention

Protecting systems from CVE-2020-4021 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Atlassian Jira Server and Data Center to versions 8.5.5 or higher to mitigate the vulnerability.
Monitor and restrict user input to prevent malicious code injection.

Long-Term Security Practices

Regularly update and patch software to address security vulnerabilities promptly.
Educate users on safe browsing practices and the risks of XSS attacks.

Patching and Updates

Apply security patches provided by Atlassian promptly to address the CVE-2020-4021 vulnerability.