SIEMENS SCALANCE XM-400 and XR-500 OSPF packet processing vulnerability

SCALANCE X switches are used to connect industrial components such as programmable logic controllers (PLCs) or human-machine interfaces (HMIs). an OSPF packet handling vulnerability exists in the SIEMENS SCALANCE XM-400 and XR-500, which stems from the OSPF protocol implementation in the device not validating the checksum and length fields in OSPF LS update messages. An attacker could exploit this vulnerability to cause a network outage by sending specially crafted OSPF packets.