CVE-2021-0288 : Security Advisory and Response

A vulnerability in Juniper Networks Junos OS on MX Series and EX9200 Series devices with Trio-based Modular Port Concentrators (MPCs) can lead to FPC crashes, causing a Denial of Service (DoS) condition. This issue affects various Junos OS versions.

Understanding CVE-2021-0288

This CVE highlights a specific vulnerability in Juniper Networks Junos OS that can result in FPC crashes on certain devices, potentially leading to a DoS situation.

What is CVE-2021-0288?

The vulnerability involves the processing of specific MPLS packets on MX Series and EX9200 Series devices with Trio-based MPCs, triggering FPC crashes and enabling a sustained DoS condition.

The Impact of CVE-2021-0288

If exploited, this vulnerability can disrupt services by causing FPC crashes on affected devices, potentially leading to a denial of service.

Technical Details of CVE-2021-0288

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The flaw in processing specific MPLS packets in Juniper Networks Junos OS may cause FPC crashes on devices with Trio-based MPCs, resulting in a DoS condition.

Affected Systems and Versions

MX Series and EX9200 Series with Trio-based PFEs running Junos OS versions prior to the specified patched releases are vulnerable to this issue.

Exploitation Mechanism

There is no known malicious exploitation of this vulnerability according to Juniper SIRT.

Mitigation and Prevention

To address CVE-2021-0288, follow these guidelines.

Immediate Steps to Take

Update Junos OS to the patched versions to mitigate the vulnerability.

Long-Term Security Practices

Regularly apply software updates and patches to protect against known vulnerabilities.

Patching and Updates

Ensure that affected Junos OS versions are updated to the fixed releases to prevent FPC crashes and potential DoS incidents.