The Invoker Servlet on SAP NetWeaver Application Server Java platforms, possibly before 7.3, does not require authentication, which allows remote attackers to execute arbitrary code via an HTTP or HTTPS request, as exploited in the wild in 2013 through 2016, aka a โDetourโ attack.
service.sap.com/sap/support/notes/1445998
www.onapsis.com/research/publications/sap-security-in-depth-vol4-the-invoker-servlet-a-dangerous-detour-into-sap-java-solutions
www.securityfocus.com/bid/48925
www.securityfocus.com/bid/90533
www.us-cert.gov/ncas/alerts/TA16-132A
www.onapsis.com/threat-report-tip-iceberg-wild-exploitation-cyber-attacks-sap-business-applications