Wind turbines on the mountain

iOS 12.5.3Released on 3 May 2021

iOS 12.5.3 is a security update and Apple recommend it for all users of devices that can be updated to iOS 12.5 &mdash iPhone 5s, iPhone 6, iPhone 6 Plus, iPad Air, iPad mini 2, iPad mini 3, and iPod touch (6th generation).

iOS 12 Logo Original:  Apple Inc. Vectorization: Dane, Public domain, via Wikimedia Commons

TL:DR— Install right away. Security fixes.

Step by step instructions

  • Open 'Software Update' from 'Settings -> General'
  • Download and install, a restart is required and it takes some time
Screenshot - iPhone 5s update screenScreenshot - iPhone 5s update screen
Screenshot - iPhone 5s update completedScreenshot - iPhone 5s update completed

Security Fixes

WebKit

  • Available for: iPhone 5s, iPhone 6, iPhone 6 Plus, iPad Air, iPad mini 2, iPad mini 3, and iPod touch (6th generation)
  • Impact: processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.
  • Description: A buffer overflow issue was addressed with improved memory handling.
  • CVE-2021-30666: yangkang (@dnpushme)&zerokeeper&bianliang of 360 ATA

WebKit

  • Available for: iPhone 5s, iPhone 6, iPhone 6 Plus, iPad Air, iPad mini 2, iPad mini 3, and iPod touch (6th generation)
  • Impact: processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.
  • Description: A memory corruption issue was addressed with improved state management.
  • CVE-2021-30665: yangkang (@dnpushme)&apm;zerokeeper&bianliang of 360 ATA

WebKit

  • Available for: iPhone 5s, iPhone 6, iPhone 6 Plus, iPad Air, iPad mini 2, iPad mini 3, and iPod touch (6th generation)
  • Impact: processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.
  • Description: An integer overflow was addressed with improved input validation.
  • CVE-2021-30663: an anonymous researcher

WebKit Storage

  • Available for: iPhone 5s, iPhone 6, iPhone 6 Plus, iPad Air, iPad mini 2, iPad mini 3, and iPod touch (6th generation)
  • Impact: processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.
  • Description: A use after free issue was addressed with improved memory management.
  • CVE-2021-30661: yangkang (@dnpushme)&apm;zerokeeper&bianliang of 360 ATA

Information is provided without recommendation or endorsement.

Confirming the iPhone, iPod touch or iPad has been updated

  • Navigate to 'Settings'
  • Select 'General'
  • Select About
  • Software Version will be '12.5.3'

See also: About the security content of iOS 12.5.3