This indicates an attack attempt against a buffer-overflow vulnerability in FeedDemon.
The vulnerability is caused by an error when the vulnerable software handles a malicious OPML file. It allows a remote attacker to execute arbitrary code via sending a crafted OPML file.
FeedDemon version 2.7 and below
System Compromise: Remote attackers can gain control of vulnerable systems.
Do not open untrusted RSS feed lists with FeedDemon.