CVE-2023-44193

/// Technical description

An Improper Release of Memory Before Removing Last Reference vulnerability in Packet Forwarding Engine (PFE) of Juniper Networks Junos OS allows a local, low privileged attacker to cause an FPC crash, leading to Denial of Service (DoS).

On all Junos MX Series with MPC1 - MPC9, LC480, LC2101, MX10003, and MX80, when Connectivity-Fault-Management (CFM) is enabled in a VPLS scenario, and a specific LDP related command is run, an FPC will crash and reboot. Continued execution of this specific LDP command can lead to sustained Denial of Service condition.

This issue affects:

Juniper Networks Junos OS on MX Series:

* All versions prior to 20.4R3-S7;

* 21.1 versions prior to 21.1R3-S5;

* 21.2 versions prior to 21.2R3-S4;

* 21.3 versions prior to 21.3R3-S4;

* 21.4 versions prior to 21.4R3-S3;

* 22.1 versions prior to 22.1R3-S1;

* 22.2 versions prior to 22.2R2-S1, 22.2R3;

* 22.3 versions prior to 22.3R1-S2, 22.3R2.

/// 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