MUTE 0.4 allows remote attackers to cause a denial of service (messages not forwarded) and obtain sensitive information about a target by filling a client's mWebCache cache with malicious "zombie" nodes.
https://exchange.xforce.ibmcloud.com/vulnerabilities/24931
http://secunia.com/advisories/18980
http://cvs.sourceforge.net/viewcvs.py/mute-net/MUTE/doc/notes/notes.txt?view=markup