The remote host is vulnerable to multiple attack vectors.
The remote host is running a version of Yahoo! Messenger that is reported vulnerable to a remote overflow. An attacker exploiting this flaw would craft a malicious message that included non-ASCII characters. The attacker would then send the malformed message to another Yahoo! Messenger user. When the user received the malicious message, the overflow would be triggered and the application would crash. In addition, the remote client is vulnerable to a flaw where remote users can initiate a browser connection by sending a malformed string to the Yahoo! Messenger Client.
Upgrade or patch according to vendor recommendations.