The CodeWrights HART Device Type Manager (DTM) library in Emerson HART DTM before 1.4.181 allows physically proximate attackers to cause a denial of service (DTM outage and FDT Frame application hang) by transmitting crafted response packets on the 4-20 mA current loop.
https://ics-cert.us-cert.gov/advisories/ICSA-15-237-01
https://ics-cert.us-cert.gov/advisories/ICSA-15-008-01A
http://www2.emersonprocess.com/siteadmincenter/PM%20Central%20Web%20Documents/EMR%20EPM14001-1.pdf