What are the security improvements for iOS 12.5 for iphone?

Thanks Peter!

But what does it mean? " Unauthorized code execution"? Is it something I did or will do?

Available for: iPhone 5s, iPhone 6, iPhone 6 Plus, iPad Air, iPad mini 2, iPad mini 3, and iPod touch (6th generation)

Impact: Unauthorized code execution may lead to an authentication policy violation

Description: This issue was addressed with improved checks.

CVE-2020-27951: Apple

Information

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Published Date: December 14, 2020

So what does "incorrect code execution" mean to someone who doesn't speak geek?