Unrestricted critical resource lock in Agnitum Outpost Firewall PRO 4.0 1007.591.145 and earlier allows local users to cause a denial of service (system hang) by capturing the outpost_ipc_hdr mutex.
https://exchange.xforce.ibmcloud.com/vulnerabilities/34686
http://www.securityfocus.com/bid/24284
http://www.securityfocus.com/archive/1/470278/100/0/threaded