CRLF injection vulnerability in the integrated web server on Siemens SIMATIC S7-1200 CPU devices 2.x and 3.x allows remote attackers to inject arbitrary HTTP headers via unspecified vectors.
https://cert-portal.siemens.com/productcert/pdf/ssa-892012.pdf
http://www.siemens.com/innovation/pool/de/forschungsfelder/siemens_security_advisory_ssa-892012.pdf