CVE-2021-33665 : What You Need to Know

SAP NetWeaver Application Server ABAP (Applications based on SAP GUI for HTML) versions KRNL64NUC - 7.49, KRNL64UC - 7.49, 7.53, KERNEL - 7.49, 7.53, 7.77, 7.81, 7.84 are vulnerable to Cross-Site Scripting (XSS) due to insufficient user-controlled inputs encoding.

Understanding CVE-2021-33665

This section will provide insights into the impact and technical details of CVE-2021-33665.

What is CVE-2021-33665?

CVE-2021-33665 affects SAP NetWeaver Application Server ABAP versions and allows attackers to execute malicious scripts in the context of a user's session, potentially leading to account hijacking or sensitive data exposure.

The Impact of CVE-2021-33665

The vulnerability poses a medium severity risk with a CVSS v3.0 base score of 5.4. Attackers can exploit it to perform Cross-Site Scripting attacks, compromising the confidentiality and integrity of user data.

Technical Details of CVE-2021-33665

Let's delve into the vulnerability description, affected systems, and exploitation mechanism.

Vulnerability Description

SAP NetWeaver Application Server ABAP versions fail to adequately encode user inputs, enabling attackers to inject and execute malicious scripts within the application.

Affected Systems and Versions

The affected versions include KRNL64NUC - 7.49, KRNL64UC - 7.49, 7.53, KERNEL - 7.49, 7.53, 7.77, 7.81, 7.84 of SAP NetWeaver Application Server ABAP.

Exploitation Mechanism

Exploiting this vulnerability requires sending specially crafted input to the application, allowing malicious scripts to be executed in the user's browser.

Mitigation and Prevention

Discover the immediate steps to take and long-term security practices to mitigate the risk posed by CVE-2021-33665.

Immediate Steps to Take

Apply available patches and security updates provided by SAP to address the XSS vulnerability in the affected versions promptly.

Long-Term Security Practices

Implement secure coding practices, input validation mechanisms, and regular security assessments to prevent XSS attacks and enhance the overall application security.

Patching and Updates

Regularly monitor security advisories from SAP and promptly apply patches to ensure the continued protection of SAP NetWeaver Application Server ABAP.