Older Apple smartphones and tablets that are not compatible with the latest and greatest iOS 15 have been at risk of being compromised through two apparently dangerous security vulnerabilities. Apple has now fixed these security issues in a recent update for its mobile operating system.
https://www.notebookcheck.net/Apple-releases-iOS-12-5-5-update-with-important-security-fixes-for-older-iPhones-and-iPads.565055.0.html