CVE-2021-35620 : What You Need to Know

This article provides detailed information about CVE-2021-35620, a vulnerability found in the Oracle WebLogic Server.

Understanding CVE-2021-35620

CVE-2021-35620 is a vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware, specifically in the Core component. It affects multiple versions of the WebLogic Server, making it susceptible to an easily exploitable attack.

What is CVE-2021-35620?

The vulnerability allows an unauthenticated attacker with network access via T3 to compromise the Oracle WebLogic Server. Successful exploitation can lead to unauthorized actions that can cause the server to hang or crash repeatedly, resulting in a denial-of-service (DOS) condition with a CVSS 3.1 Base Score of 7.5.

The Impact of CVE-2021-35620

The impact of this vulnerability is rated as high due to its potential to disrupt the availability of the Oracle WebLogic Server. Attackers can exploit this flaw to cause significant disruptions to the server's operation, leading to service unavailability.

Technical Details of CVE-2021-35620

This section dives into the specific technical details of the CVE-2021-35620 vulnerability.

Vulnerability Description

CVE-2021-35620 is characterized by an easily exploitable flaw that allows unauthorized attackers to compromise the Oracle WebLogic Server. The affected versions of the WebLogic Server are 10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0, 12.2.1.4.0, and 14.1.1.0.0.

Affected Systems and Versions

The vulnerability impacts Oracle WebLogic Server versions 10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0, 12.2.1.4.0, and 14.1.1.0.0. These versions are confirmed to be vulnerable to the described exploit.

Exploitation Mechanism

An unauthenticated attacker with network access via T3 can exploit this vulnerability to compromise the Oracle WebLogic Server. Successful attacks can lead to the server hanging or crashing, resulting in significant disruptions.

Mitigation and Prevention

To address CVE-2021-35620, certain mitigation and prevention measures can be implemented to secure systems against potential attacks.

Immediate Steps to Take

It is crucial to apply security patches provided by Oracle to mitigate the vulnerability effectively. Additionally, restricting network access and monitoring for any suspicious activities can help prevent unauthorized exploitation.

Long-Term Security Practices

Regular security audits, implementing strong access controls, and keeping systems up to date with the latest patches are essential for maintaining a secure environment.

Patching and Updates

Organizations using affected versions of Oracle WebLogic Server should promptly apply the patches released by Oracle to address CVE-2021-35620 and enhance the security posture of their systems.