Junos OS: QFX5000 Series and EX4000 Series: Denial of Service (DoS) on a large scale VLAN due to PFE hogging

An Allocation of Resources Without Limits or Throttling vulnerability in Juniper Networks Junos OS allows an unauthenticated, network-based attacker to cause Denial of Service (DoS).

On all Junos OS QFX5000 Series and EX4000 Series platforms, when a high number of VLANs are configured, a specific DHCP packet will cause PFE hogging which will lead to dropping of socket connections.

This issue affects:

Juniper Networks Junos OS on QFX5000 Series and EX4000 Series

* 21.1 versions prior to 21.1R3-S5;

* 21.2 versions prior to 21.2R3-S5;

* 21.3 versions prior to 21.3R3-S5;

* 21.4 versions prior to 21.4R3-S4;

* 22.1 versions prior to 22.1R3-S3;

* 22.2 versions prior to 22.2R3-S1;

* 22.3 versions prior to 22.3R2-S2, 22.3R3;

* 22.4 versions prior to 22.4R2.

This issue does not affect Juniper Networks Junos OS versions prior to 21.1R1