Microsoft is aware of vulnerabilities in the third party Motorola Soft Modem drivers that ships natively with supported Windows operating systems.
This is an announcement of the upcoming removal of smserl64.sys and smserial.sys drivers. The drivers have been removed in the January cumulative update.
Soft modem hardware dependent on these specific drivers will no longer work on Windows.
Microsoft recommends removing any existing dependencies on this hardware.
7.8