Vulnerable server : KB4025339 or superseding KB cannot be found

KB4025339 == the July 11, 2017- (OS Build 14393.1480) Since the current build is 14393.5356 you couldn't install an older rollup. Monthly rollups are cumulative and contain new fixes plus all the previous monthly rollups. So nothing further is needed on your part.

Rather than receiving several updates each month and trying to figure out which the organization needs, which ultimately causes platform fragmentation, administrators see one cumulative monthly update that supersedes the previous month’s update, containing both security and non-security fixes. This approach makes updating simpler and ensures that devices are more closely aligned with the testing done at Microsoft, reducing unexpected issues resulting from updates.

Overview of Windows as a service - Windows Deployment | Microsoft Learn