Wind River VxWorks before 5.5.1, 6.5.x through 6.7.x before 6.7.1.1, 6.8.x before 6.8.3, 6.9.x before 6.9.4.4, and 7.x before 7 ipnet_coreip 1.2.2.0, as used on Schneider Electric SAGE RTU devices before J2 and other devices, does not properly generate TCP initial sequence number (ISN) values, which makes it easier for remote attackers to spoof TCP sessions by predicting an ISN value.
https://security.netapp.com/advisory/ntap-20160324-0001/
https://ics-cert.us-cert.gov/advisories/ICSA-15-169-01A
https://ics-cert.us-cert.gov/advisories/ICSA-15-169-01
http://www.securitytracker.com/id/1033181
http://www.securitytracker.com/id/1032730
http://www.securityfocus.com/bid/75302
http://www.schneider-electric.com/ww/en/download/document/SEVD-2015-162-01