GE Healthcare Optima CT680, CT540, CT640, and CT520 has a default password of #bigguy for the root user, which has unspecified impact and attack vectors.

References

• https://nvd.nist.gov/vuln/detail/CVE-2010-5306
• https://ics-cert.us-cert.gov/advisories/ICSMA-18-037-02
• https://twitter.com/digitalbond/status/619250429751222277
• http://apps.gehealthcare.com/servlet/ClientServlet/5341628-1EN_r12.pdf?REQ=RAA&DIRECTION=5341628-1EN&FILENAME=5341628-1EN_r12.pdf&FILEREV=12&DOCREV_ORG=12
• http://apps.gehealthcare.com/servlet/ClientServlet/5401943_rev+3.pdf?REQ=RAA&DIRECTION=5401943&FILENAME=5401943_rev%2B3.pdf&FILEREV=3&DOCREV_ORG=3
• http://apps.gehealthcare.com/servlet/ClientServlet/5472001-1EN_rev2.pdf?REQ=RAA&DIRECTION=5472001-1EN&FILENAME=5472001-1EN_rev2.pdf&FILEREV=2&DOCREV_ORG=2
• http://www.forbes.com/sites/thomasbrewster/2015/07/10/vulnerable-breasts