CVE-2023-36840 : What You Need to Know

A Reachable Assertion vulnerability in Routing Protocol Daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows a locally-based, low-privileged attacker to cause a Denial of Service (DoS).

Understanding CVE-2023-36840

This CVE affects Juniper Networks Junos OS and Junos OS Evolved, leading to a Denial of Service (DoS) condition due to a specific L2VPN command that crashes and restarts RPD.

What is CVE-2023-36840?

CVE-2023-36840 is a vulnerability in Juniper Networks Junos OS and Junos OS Evolved that enables a low-privileged attacker to trigger a Denial of Service (DoS) attack by executing a particular command.

The Impact of CVE-2023-36840

The vulnerability allows an attacker to disrupt network operations, causing service downtime and potentially impacting the integrity of network services.

Technical Details of CVE-2023-36840

The Reachable Assertion vulnerability affects multiple versions of Junos OS and Junos OS Evolved.

Vulnerability Description

When a specific L2VPN command is executed, the Routing Protocol Daemon (RPD) crashes and restarts, creating a sustained Denial of Service (DoS) condition.

Affected Systems and Versions

All versions prior to specific releases are vulnerable for both Junos OS and Junos OS Evolved.

Exploitation Mechanism

There is no known malicious exploitation of this vulnerability at the moment.

Mitigation and Prevention

To mitigate the CVE-2023-36840 vulnerability, Juniper Networks recommends taking immediate steps and implementing long-term security practices.

Immediate Steps to Take

Access lists or firewall filters can be used to limit access to devices to trusted hosts, networks, and administrators.

Long-Term Security Practices

Ensure software updates are applied promptly to address the vulnerability and enhance overall security.

Patching and Updates

Juniper Networks has released updated software versions to resolve the issue for both Junos OS and Junos OS Evolved.