SCTP ICMPv6 error processing vulnerability (CVE-2016-1879) A detailed write up can be found at http://blog.ptsecurity.com/2016/01/severe-vulnerabilities-detected-in.html?m=1 (video demo is a nice touch) tl;dr The default configuration of FreeBSD (v9.3, 10.1, and 10.2) is vulnerable to maliciously crafted ICMPv6 message.