CVE-2023-36840

/// Technical description

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).

On all Junos OS and Junos OS Evolved, when a specific L2VPN command is run, RPD will crash and restart. Continued execution of this specific command will create a sustained Denial of Service (DoS) condition.

This issue affects:

Juniper Networks Junos OS

All versions prior to 19.3R3-S10;

20.1 versions prior to 20.1R3-S4;

20.2 versions prior to 20.2R3-S6;

20.3 versions prior to 20.3R3-S6;

20.4 versions prior to 20.4R3-S5;

21.1 versions prior to 21.1R3-S4;

21.2 versions prior to 21.2R3-S3;

21.3 versions prior to 21.3R3-S2;

21.4 versions prior to 21.4R3;

22.1 versions prior to 22.1R3;

22.2 versions prior to 22.2R2;

22.3 versions prior to 22.3R2;

Juniper Networks Junos OS Evolved

All versions prior to 20.4R3-S7-EVO;

21.1 versions prior to 21.1R3-S3-EVO;

21.2 versions prior to 21.2R3-S5-EV

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References