Running a system on SP3 without Update 1 leaves a plant vulnerable to known vulnerabilities that the update patches. While the software is legacy, many manufacturing facilities continue to run WinCC 7.0 SP3 because the cost of migrating a fully operational, complex SCADA system is prohibitive. Therefore, Update 1 remains a vital component of the "maintenance strategy" for these legacy systems, squeezing additional years of reliable life out of aging hardware and software.
Are you still running WinCC 7.0 in production? Let us know in the comments why you haven't migrated to WinCC Unified yet! wincc 70 sp3 update 1 upd
Update 7 for WinCC V7.0 SP3 and WinCC V7.0 SP3 ASIA - Support Running a system on SP3 without Update 1