The Message Session window in Mirabilis ICQ Pro 2003a allows remote attackers to cause a denial of service (CPU consumption) by spoofing the address of an ADS server and sending HTML with a -1 width in a table tag.
https://exchange.xforce.ibmcloud.com/vulnerabilities/11947
http://www.securityfocus.com/bid/7465
http://www.coresecurity.com/common/showdoc.php?idx=315&idxseccion=10
http://marc.info/?l=bugtraq&m=105216842131995&w=2
http://archives.neohapsis.com/archives/vulnwatch/2003-q2/0051.html