The compile_tree function in ef_compiler.c in the Etterfilter utility in Ettercap 0.8.2 and earlier allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted filter.
https://github.com/LocutusOfBorg/ettercap/commit/626dc56686f15f2dda13c48f78c2a666cb6d8506
https://github.com/Ettercap/ettercap/issues/782
http://www.securitytracker.com/id/1038057
http://www.securityfocus.com/bid/96582
http://www.securityfocus.com/archive/1/540223/100/0/threaded