CVE-2021-0237 : Vulnerability Insights and Analysis

A detailed analysis of CVE-2021-0237, a vulnerability in Juniper Networks' Junos OS affecting EX4300-MP Series, EX4600 Series, EX4650 Series, and QFX5K Series.

Understanding CVE-2021-0237

This section sheds light on the impact, technical details, and mitigation strategies related to CVE-2021-0237.

What is CVE-2021-0237?

The vulnerability affects platforms running Junos OS in a Virtual Chassis setup, leading to Packet Forwarding Engine manager (FXPC) process crashes, causing Denial of Service (DoS) due to specific Layer 2 frames.

The Impact of CVE-2021-0237

The vulnerability may result in a sustained DoS condition on the affected Juniper Networks platforms, potentially disrupting network operations.

Technical Details of CVE-2021-0237

Get insights into the specifics of the CVE-2021-0237 vulnerability, including its description, affected systems, and exploitation mechanism.

Vulnerability Description

The FXPC process crash due to specific Layer 2 frames in Virtual Chassis deployments can trigger a DoS situation, impacting network availability.

Affected Systems and Versions

Junos OS versions ranging from 15.1 to 20.3 deployed in EX4300-MP, EX4600, EX4650, and QFX5K Series platforms are susceptible to this vulnerability.

Exploitation Mechanism

While the Juniper SIRT has not reported any malicious attacks exploiting this vulnerability, the continued receipt and processing of specific layer 2 frames can lead to a DoS scenario.

Mitigation and Prevention

Discover the immediate steps to alleviate the risk posed by CVE-2021-0237 and establish long-term security practices for robust network defense.

Immediate Steps to Take

Update to the patched software versions, including 15.1R7-S9, 17.3R3-S11, 17.4R2-S13, and subsequent releases to prevent exploitation of this vulnerability.

Long-Term Security Practices

Regularly monitor for security advisories and apply necessary patches promptly to safeguard against potential threats.

Patching and Updates

Refer to the official Juniper Networks solution that lists the updated software releases addressing the CVE-2021-0237 vulnerability.

For more information, visit Juniper Networks Advisory.