AOL Instant Messenger (AIM) 6.1.32.1 on Windows XP allows remote attackers to cause a denial of service (application hang) via a flood of spoofed SIP INVITE requests.
https://exchange.xforce.ibmcloud.com/vulnerabilities/35068
http://www.sipera.com/index.php?action=resources%2Cthreat_advisory&tid=293&