A vulnerability has been identified in Siemens APOGEE PXC and TALON TC BACnet Automation Controllers in all versions <V3.5. An attacker with network access to the integrated web server (80/tcp and 443/tcp) could bypass the authentication and download sensitive information from the device.
https://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-148078.pdf
https://packetstorm.news/files/id/169544
https://cert-portal.siemens.com/productcert/pdf/ssa-148078.pdf
http://www.securityfocus.com/bid/101248
http://packetstormsecurity.com/files/169544/Siemens-APOGEE-PXC-TALON-TC-Authentication-Bypass.html