Jiří Filip If you are one of those users who immediately installs every new version of Apple's OS, we have some interesting news for you. A little while ago, Apple released iOS 15.2.1 and iPadOS 15.2.1 to the public, thanks to which absolutely everyone can now install it. This happens without any previous beta testing, and what's more - even without a description for the update (well, at least in our editorial office). With these facts in mind, it is therefore likely that in both cases it is a fix for a security bug, or other bugs causing bigger problems on iPhones and iPads.
Impact: Processing a maliciously crafted HomeKit accessory name may cause a denial of service
Description: A resource exhaustion issue was addressed with improved input validation.
Source: https://support.apple.com/en-us/HT213043
iOS 15.2.1 includes bug fixes for your iPhone including the following issues:
Messages may not have loaded photos sent via an iCloud link
Third-party CarPlay apps may not have responded to input
For security information included in Apple software updates, visit the following website:
https://support.apple.com/kb/HT201222