SAP Internet Graphics Server (IGS) Portwatcher, 7.20, 7.20EXT, 7.45, 7.49, 7.53, allows an attacker to prevent legitimate users from accessing a service, either by crashing or flooding the service.
https://launchpad.support.sap.com/#/notes/2617553
https://blogs.sap.com/2018/05/08/sap-security-patch-day-may-2018/