Siemens SICAM MIC devices with firmware before 2404 allow remote attackers to bypass authentication and obtain administrative access via unspecified HTTP requests.
https://ics-cert.us-cert.gov/advisories/ICSA-15-195-01
http://www.siemens.com/innovation/pool/de/forschungsfelder/siemens_security_advisory_ssa-632547.pdf