Triangle MicroWorks SCADA Data Gateway before 3.00.0635 allows physically proximate attackers to cause a denial of service (excessive data processing) via a crafted DNP request over a serial line.
https://www.cisa.gov/news-events/ics-advisories/icsa-14-149-01
https://euvd.enisa.europa.eu/vulnerability/EUVD-2014-2380
http://www.trianglemicroworks.com/products/scada-data-gateway/what%27s-new