About the security content of Safari 15

This document describes the security content of Safari 15.

About Apple security updates

For our customers' protection, Apple doesn't disclose, discuss, or confirm security issues until an investigation has occurred and patches or releases are available. Recent releases are listed on the Apple security updates page.

Apple security documents reference vulnerabilities by CVE-ID when possible.

For more information about security, see the Apple Product Security page.

Safari 15

Released September 20, 2021

WebKit

Available for: macOS Big Sur and macOS Catalina

Impact: Processing maliciously crafted web content may lead to arbitrary code execution

Description: A memory corruption issue was addressed with improved memory handling.

CVE-2021-30846: Sergei Glazunov of Google Project Zero

WebKit

Available for: macOS Big Sur and macOS Catalina

Impact: Processing maliciously crafted web content may lead to code execution

Description: A memory corruption issue was addressed with improved memory handling.

CVE-2021-30848: Sergei Glazunov of Google Project Zero

WebKit

Available for: macOS Big Sur and macOS Catalina

Impact: Processing maliciously crafted web content may lead to arbitrary code execution

Description: Multiple memory corruption issues were addressed with improved memory handling.

CVE-2021-30849: Sergei Glazunov of Google Project Zero

WebKit

Available for: macOS Big Sur and macOS Catalina

Impact: Processing maliciously crafted web content may lead to code execution

Description: A memory corruption vulnerability was addressed with improved locking.

CVE-2021-30851: Samuel Groß of Google Project Zero