mICQ 0.4.9 and earlier allows remote attackers to cause a denial of service (crash) via malformed ICQ message types without a 0xFE separator character.
https://exchange.xforce.ibmcloud.com/vulnerabilities/10872
https://euvd.enisa.europa.eu/vulnerability/EUVD-2002-1346
http://www.securityfocus.com/bid/6392