CVE-2021-0262 : Vulnerability Insights and Analysis

A detailed overview of the Use After Free vulnerability found during routine static code analysis in Juniper Networks Junos OS on QFX10002-60C switching platform.

Understanding CVE-2021-0262

This section provides insights into the vulnerability, its impact, technical details, and mitigation strategies.

What is CVE-2021-0262?

The Secure Development Life Cycle team identified a Use After Free vulnerability in PFE packet processing on the QFX10002-60C platform. Exploitation may lead to DoS by a logically adjacent attacker.

The Impact of CVE-2021-0262

The vulnerability's CVSS base score is 6.5, posing a medium severity risk. It affects specific versions of Juniper Networks Junos OS on QFX10002-60C only.

Technical Details of CVE-2021-0262

Here, we delve into the vulnerability description, affected systems, and exploitation mechanism.

Vulnerability Description

The flaw allows a DoS attack on QFX10002-60C devices through a Use After Free vulnerability in packet processing.

Affected Systems and Versions

Versions like 19.1R3-S1, 19.2R2, and 20.2 prior to specified releases are vulnerable, while others remain unaffected.

Exploitation Mechanism

It involves triggering a Denial of Service condition by exploiting the identified Use After Free vulnerability.

Mitigation and Prevention

Explore the immediate steps, long-term security practices, and patching measures to mitigate the risks effectively.

Immediate Steps to Take

Upgrade to Junos OS 19.1R3-S3, 19.2R3-S1, 20.2R1-S2, or later to eliminate the vulnerability.

Long-Term Security Practices

Regularly update your Junos OS to the latest versions and follow security best practices to enhance network safety.

Patching and Updates

Refer to official Juniper Networks solutions for patches and ensure timely application to secure your systems.