pfSense pfBlockerNG through 2.1.4_26 allows remote attackers to execute arbitrary OS commands as root via shell metacharacters in the HTTP Host header. NOTE: 3.x is unaffected.
This Metasploit module leverages a remote shell upload vulnerability in pfSense pfBlockerNG plugin versions 2.1.4_26 and below. Note that version 3.x is unaffected.