The remote host is vulnerable to a buffer overflow.
The remote host is running Microsoft MSN Messenger. There is a flaw in this version of MSN Messenger that would allow a remote attacker to potentially execute code on the target host. The flaw is in the processing of GIF images. An attacker exploiting this flaw would need to be able to convince a user to view a GIF image (such as an emoticon or icon). Successful exploitation would lead to arbitrary code being executed on the vulnerable system.
Upgrade or patch according to vendor recommendations.