Apple security advisory

Number: AV21-204
Date: 4 May 2021


On 3 May 2021 Apple published a Security Update to address vulnerabilities in the following products:

  • watchOS – versions prior to 7.4.1
  • iOS 12 – versions prior to 12.5.3
  • iOS 14 – versions prior to 14.5.1
  • iPadOS – versions prior to 14.5.1
  • macOS Big Sur – versions prior to 11.3.1

Exploitation of some these vulnerabilities could result in arbitrary code execution.  Apple has received reports that some of these vulnerabilities have been actively exploited.

The Cyber Centre encourages users and administrators to review the following web link and apply the necessary updates.

watchOS
https://support.apple.com/en-us/HT212339

iOS 12
https://support.apple.com/en-us/HT212341

iOS and iPadOS 14
https://support.apple.com/en-us/HT212336

macOS Big Sur
https://support.apple.com/en-us/HT212335

Apple Security Updates
https://support.apple.com/en-us/HT201222

Note to Readers

The Canadian Centre for Cyber Security (Cyber Centre) operates as part of the Communications Security Establishment.  We are Canada’s national authority on cyber security and we lead the government’s response to cyber security events. As Canada's national computer security incident response team, the Cyber Centre works in close collaboration with government departments, critical infrastructure, Canadian businesses and international partners to prepare for, respond to, mitigate, and recover from cyber events. We do this by providing authoritative advice and support, and coordinating information sharing and incident response. The Cyber Centre is outward-facing, welcoming partnerships that help build a stronger, more resilient cyber space in Canada.

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