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 ipnetcoreip 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.
The Schneider Electric Telvent SAGE 3030 RTU with firmware C3413-500-001D3P4 and C3413-500-001F0PB allows remote attackers to cause a denial of service (temporary outage and CPU consumption) via malformed DNP3 traffic.