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APPLE-SA-2021-05-03-4 macOS Big Sur 11.3.1

macOS Big Sur 11.3.1 addresses the following issues.
Information about the security content is also available at
https://support.apple.com/HT212335.

WebKit
Available for: macOS Big Sur
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)&zerokeeper&bianliang of 360 ATA

WebKit
Available for: macOS Big Sur
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

Installation note:

This update may be obtained from the Mac App Store or
Apple's Software Downloads web site:
https://support.apple.com/downloads/

Information will also be posted to the Apple Security Updates
web site: https://support.apple.com/kb/HT201222

This message is signed with Apple's Product Security PGP key,
and details are available at:
https://www.apple.com/support/security/pgp/
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