Apple has released a security update for older iDevices (iPhones, iPads and iPods) to fix three vulnerabilities, two of which are zero-days that are apparently actively exploited in attacks in the wild. The security update is iOS 12.5.4, which can still be run on iPhone 5s, iPhone 6 Plus, iPad Air, iPad mini 2 and iPad mini 3, and iPod touch (6th generation) Users should implement the update as soon as possible, Apple says.
Source: https://www.helpnetsecurity.com/2021/06/16/vulnerabilities-affecting-older-idevices/