ICS CERT has had a mixed history of success and failure. With Stuxnet and Siemens vulnerabilities, most of ICS-CERT’s history is not very good. The latest blow to ICS-CERT’s credibility is Ralph Langner’s blog:
http://www.langner.com/en/2011/08/20/ics-cert-on-beresford-vulns-flawed-analysis-misleading-advice/#more-1062
Joe Weiss