Akfingerd 0.5 and possibly earlier versions only allows one connection at a time and does not time out connections, which allows remote attackers to cause a denial of service (refused connections) by opening a connection and not closing it.
https://exchange.xforce.ibmcloud.com/vulnerabilities/10794
http://www.securityfocus.com/bid/6323
http://archives.neohapsis.com/archives/bugtraq/2002-12/0049.html