AOL Instant Messenger (AIM) 4.7.2480 and earlier allows remote attackers to cause a denial of service (application crash) via an instant message that contains a large amount of "<!--" HTML comments.
https://exchange.xforce.ibmcloud.com/vulnerabilities/7233
https://euvd.enisa.europa.eu/vulnerability/EUVD-2001-1399
http://www.securityfocus.com/bid/3398
http://www.securityfocus.com/archive/1/247707
http://www.kb.cert.org/vuls/id/JARL-56TPTN
http://www.kb.cert.org/vuls/id/507771
http://archives.neohapsis.com/archives/bugtraq/2001-10/0014.html