The IMAP server in IBM Domino 8.5.x before 8.5.3 FP6 IF1 and 9.0.x before 9.0.1 FP1 allows remote attackers to cause a denial of service (daemon crash) via unspecified vectors, aka SPR KLYH9F4S2Z.
https://exchange.xforce.ibmcloud.com/vulnerabilities/90235
http://www-01.ibm.com/support/docview.wss?uid=swg21663023