CVE-2024-21599

/// Technical description

A Missing Release of Memory after Effective Lifetime vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on MX Series allows an adjacent, unauthenticated attacker to cause a Denial of Service (DoS).

If an MX Series device receives PTP packets on an MPC3E that doesn't support PTP this causes a memory leak which will result in unpredictable behavior and ultimately in an MPC crash and restart.

To monitor for this issue, please use the following FPC vty level commands:

show heap

shows an increase in "LAN buffer" utilization and

show clksync ptp nbr-upd-info

shows non-zero "Pending PFEs" counter.

This issue affects Juniper Networks Junos OS on MX Series with MPC3E:

* All versions earlier than 20.4R3-S3;

* 21.1 versions earlier than 21.1R3-S4;

* 21.2 versions earlier than 21.2R3;

* 21.3 versions earlier than 21.3R2-S1, 21.3R3;

* 21.4 versions earlier than 21.4R2;

* 22.1 versions earlier than 22.1R2.

/// 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