CVE-2020-1655 : What You Need to Know

This CVE involves a vulnerability in Juniper Networks Junos OS on MX Series devices that can lead to a sustained Denial of Service attack, affecting several versions of the software.

Understanding CVE-2020-1655

This article provides insights into the impact, technical details, and mitigation strategies regarding CVE-2020-1655.

What is CVE-2020-1655?

The vulnerability in the Junos OS on MX Series devices could allow an attacker to repeatedly disable the packet forwarding engine (PFE) by sending fragmented packets, resulting in a Denial of Service (DoS) attack.

The Impact of CVE-2020-1655

Severity: Medium with a CVSS base score of 5.3
Attack Vector: Network
Privileges Required: None
Scope: Unchanged
The vulnerability affects Juniper Networks Junos OS on various MX Series versions.

Technical Details of CVE-2020-1655

This section delves into specific technical aspects of the vulnerability.

Vulnerability Description

Enabling inline IP reassembly can lead to PFE crashes on devices with certain line cards and configurations.

Affected Systems and Versions

The vulnerability impacts various versions of Junos OS on MX Series devices prior to specific patched releases.

Exploitation Mechanism

Continuously sending fragmented packets that cannot be reassembled can disable the PFE, leading to a DoS.

Mitigation and Prevention

Learn how to mitigate the risks associated with CVE-2020-1655.

Immediate Steps to Take

Upgrade to the fixed software releases specified in the solutions.

Long-Term Security Practices

Follow best practices to secure your network infrastructure from similar vulnerabilities.

Patching and Updates

Ensure timely updates and patches to maintain the security of your systems.