SLD Registration of ABAP Platform allows an attacker to prevent legitimate users from accessing a service, either by crashing or flooding the service. Fixed in versions KRNL32NUC 7.21, 7.21EXT, 7.22, 7.22EXT,KRNL32UC 7.21, 7.21EXT, 7.22, 7.22EXT, KRNL64NUC 7.21, 7.21EXT, 7.22, 7.22EXT, 7.49,KRNL64UC 7.21, 7.21EXT, 7.22, 7.22EXT, 7.49. 7.73 KERNEL from 7.21 to 7.22, 7.45, 7.49, 7.53, 7.73, 7.75.