CVE-2017-1000479

pfSense versions 2.4.1 and lower are vulnerable to a clickjacking attacks in the CSRF error page resulting in privileged execution of arbitrary code. See first reference URL for full details. Credits are Yorick Koster. OPNsense, a 2015 fork of pfSense, was not vulnerable since version 16.1.16 released on June 06, 2016. The unprotected web form was removed from the code during an internal security audit under "possibly insecure" suspicions.

Source: CVE-2017-1000479