What is the update include 14.4.2

This update, per the notes, improved management of web object lifetimes based on a report by Google security team members.

While connected to maliciously crafted web content there was a risk of universal cross site scripting that could compromise your data. Apple became aware via that report - this particular issue “may have been actively exploited”.

So no definite knowledge of malware exploiting it in the wild - but it is wise to do the update to avoid being a Day 0 victims somewhere down the road. Such “double dot” updates will be rolled-up into 14.5 anyway, but you’d be exposed to a real-world update in the meantime.

ipad 12.9 pro

just obtained an update 1-2 weeks ago, was this exploit missed? Emulating this update, it appears, email and other installed apps focused on social media and some browsers have issues if revisions/ patches are applied. Appears issues with telephone communications might occur where IPhone/ IPad/ Mac OS are linked through ICloud services. Also noted, on iMac a new remote support service/ Chinese language support/ etc. etc.... exist that previously did not exist on Imac, late 2013 model 27inch. Core i5. This is cache support which was not ever requested by the end user. Having edited this out of the OS user profile, it’s stands to reason why one might ask specifics be provided.

reference;

https://www.technologyreview.com/2021/03/26/1021318/google-security-shut-down-counter-terrorist-us-ally/

and;

https://bgr.com/2021/03/29/iphone-security-update-ios-14-4-2-ios-12-5-2-safari-webkit-zero-day/

cc: DHS, NSA; osbpp; et al...

Apple can you provide more specifics please?

Security fixes.

Must have been a big one because Apple even pushed out and update for iOS 12 for older devices.