CVE-2021-0226 Explained : Impact and Mitigation

Juniper Networks Junos OS Evolved devices are prone to a vulnerability where receipt of a specific IPv6 packet may lead to termination of an established IPv6 BGP session, resulting in a Denial of Service (DoS) condition.

Understanding CVE-2021-0226

This CVE highlights a vulnerability in Junos OS Evolved that can impact the stability of IPv6 BGP sessions.

What is CVE-2021-0226?

A specific IPv6 packet can trigger the termination of established IPv6 BGP sessions on Juniper Networks Junos OS Evolved devices, causing a DoS situation.

The Impact of CVE-2021-0226

The vulnerability can lead to a Denial of Service (DoS) condition on devices running Junos OS Evolved, affecting IBGP or EBGP peer sessions with IPv6.

Technical Details of CVE-2021-0226

This section provides insight into the specifics of the CVE.

Vulnerability Description

The vulnerability allows for termination of IPv6 BGP sessions on Junos OS Evolved devices, leading to DoS conditions.

Affected Systems and Versions

Juniper Networks Junos OS Evolved versions 19.4-EVO, 20.1-EVO, 20.2-EVO, and 20.3-EVO are impacted by this vulnerability.

Exploitation Mechanism

Currently, there are no known instances of malicious exploitation of this vulnerability by Juniper SIRT.

Mitigation and Prevention

Learn about different ways to address and prevent CVE-2021-0226.

Immediate Steps to Take

Update Junos OS Evolved to versions 19.4R2-S3-EVO, 20.1R2-S3-EVO, 20.2R2-S1-EVO, 20.3R2-EVO, 20.4R1-EVO, or subsequent releases for a resolution.

Long-Term Security Practices

Implement a robust network security posture to prevent and mitigate potential vulnerabilities in the future.

Patching and Updates

Regularly check for and apply software updates to ensure systems are protected from known vulnerabilities.