Buffer overflow in certain RPC routines in IBM AIX 4.3 may allow attackers to execute arbitrary code, related to a "variable data type."
https://exchange.xforce.ibmcloud.com/vulnerabilities/10112
http://www.kb.cert.org/vuls/id/273779
http://www-1.ibm.com/support/search.wss?rs=0&q=IY28706&apar=only