IBM HACMP 4.4 allows remote attackers to cause a denial of service via a completed TCP connection to HACMP ports (e.g., using a port scan) that does not send additional data, which causes a failure in snmpd.
https://exchange.xforce.ibmcloud.com/vulnerabilities/7165
http://www.securityfocus.com/archive/1/217910
http://www.securityfocus.com/archive/1/216105
http://www-1.ibm.com/support/search.wss?rs=0&q=IY20943&apar=only
http://www-1.ibm.com/support/search.wss?rs=0&q=IY17630&apar=only