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.
blog.sec-consult.com/2016/01/deliberately-hidden-backdoor-account-in.html
seclists.org/fulldisclosure/2016/Jan/63
www.amx.com/techcenter/firmware.asp?Category=Hot%20Fix%20Files
www.amx.com/techcenter/NXSecurityBrief/
www.securityfocus.com/archive/1/537343/100/0/threaded
www.securityfocus.com/bid/81545
ics-cert.us-cert.gov/advisories/ICSA-16-049-02
www.kb.cert.org/vuls/id/992624
www.sec-consult.com/fxdata/seccons/prod/temedia/advisories_txt/20160121-0_AMX_Deliberately_hidden_backdoor_account_v10.txt