Junos OS and Junos OS Evolved: Upon processing specific L2 traffic, rpd can hang in devices with EVPN/VXLAN configured

An Improper Check for Unusual or Exceptional Conditions vulnerability in the Layer 2 Address Learning Daemon (l2ald) on Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause Denial of Service (DoS).

In an EVPN/VXLAN scenario, when a high amount specific Layer 2 packets are processed by the device, it can cause the Routing Protocol Daemon (rpd) to utilize all CPU resources which causes the device to hang. A manual restart of the rpd is required to restore services.

This issue affects both IPv4 and IPv6 implementations.

This issue affects

Junos OS:

All versions earlier than 21.4R3-S7;

22.1 versions earlier than 22.1R3-S5;

22.2 versions earlier than 22.2R3-S3;

22.3 versions earlier than 22.3R3-S3;

22.4 versions earlier than 22.4R3-S2;

23.2 versions earlier than 23.2R2;

23.4 versions earlier than 23.4R1-S1.

Junos OS Evolved:

All versions earlier than 21.4R3-S7-EVO;

22.1-EVO versions earlier than 22.1R3-S5-EVO;

22.2-EVO versions earlier than 22.2R3-S3-EVO;

22.3-EVO versions earlier than 22.3R3-S3-EVO;

22.4-EVO versions earlier than 22.4R3-S2-EVO;

23.2-EVO versions earlier than 23.2R2-EVO;

23.4-EVO versions earlier than 23.4R1-S1-EVO, 23.4R2-EVO.