CVE-2023-44189 (junos_os_evolved)

An Origin Validation vulnerability in MAC address validation of Juniper Networks Junos OS Evolved on PTX10003 Series allows a network-adjacent attacker to bypass MAC address checking, allowing MAC addresses not intended to reach the adjacent LAN to be forwarded to the downstream network. Due to this issue, the router will start forwarding traffic if a valid route is present in forwarding-table, causing a loop and congestion in the downstream layer-2 domain connected to the device.

This issue affects Juniper Networks …

address addresses a network attacker bypass cve forwarding issue juniper juniper networks junos junos os lan mac mac address mac addresses network networks origin router series start traffic valid validation vulnerability