CVE-2021-21491 Explained : Impact and Mitigation

This article provides detailed information about CVE-2021-21491, a vulnerability found in SAP NetWeaver Application Server Java affecting multiple versions.

Understanding CVE-2021-21491

CVE-2021-21491 is a vulnerability in SAP NetWeaver Application Server Java that allows attackers to redirect users to malicious sites due to Reverse Tabnabbing vulnerabilities.

What is CVE-2021-21491?

SAP Netweaver Application Server Java versions 7.00, 7.10, 7.11, 7.20, 7.30, 7.31, 7.40, 7.50 are impacted by this vulnerability that enables attackers to perform unauthorized redirection of users.

The Impact of CVE-2021-21491

The vulnerability poses a medium-level threat with a CVSS base score of 4.7. Attackers can manipulate user interactions to lead them to malicious websites, potentially exposing sensitive information.

Technical Details of CVE-2021-21491

This section outlines the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability in SAP NetWeaver Application Server Java allows attackers to exploit Reverse Tabnabbing to redirect users to malicious sites without their consent.

Affected Systems and Versions

Products based on Web Dynpro Java with versions prior to 7.50 are impacted by this vulnerability.

Exploitation Mechanism

Attackers can trick users into visiting malicious websites by manipulating links on legitimate webpages using the Reverse Tabnabbing technique.

Mitigation and Prevention

Protecting your systems from CVE-2021-21491 is crucial to maintaining security.

Immediate Steps to Take

Ensure that all affected systems are updated to versions 7.50 or higher to mitigate the risk of exploitation.

Long-Term Security Practices

Regularly monitor and review security configurations and user interactions on SAP NetWeaver Application Server Java to detect and prevent unauthorized redirections.

Patching and Updates

Stay informed about security patches and updates released by SAP to address CVE-2021-21491 and other vulnerabilities.