The setUpSubtleUserAccount function in /bin/bw on Harman AMX devices before 2015-10-12 has a hardcoded password for the BlackWidow account, which makes it easier for remote attackers to obtain access via a (1) SSH or (2) HTTP session, a different vulnerability than CVE-2016-1984.
https://www.kb.cert.org/vuls/id/992624
https://ics-cert.us-cert.gov/advisories/ICSA-16-049-02
http://www.securityfocus.com/bid/81545
http://www.securityfocus.com/archive/1/537343/100/0/threaded
http://www.amx.com/techcenter/firmware.asp?Category=Hot%20Fix%20Files