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Incident Response

Apple Ships Urgent iOS Patch for WebKit Zero-Day

Apple rolls out urgent iOS and iPadOS software updates and warned that zero-day exploitation has already been detected.

iOS Zero-Day Exploits

Apple on Monday rolled out an urgent software update to its iOS and iPadOS mobile operating systems and warned that zero-day exploitation has already been detected.

For the second time since adopting the “rapid security responses” process to address zero-day attacks, Apple pushed iOS 16.5.1 (a) and iPadOS 16.5.1 (a) to devices globally after an anonymous researcher disclosed the underlying vulnerability.

A barebones advisory from Cupertino said the security defect exists in WebKit, the browser engine used by Safari, Mail, AppStore and many other apps on iOS- and macOS-powered devices.

“Processing web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited,” the company said. “The issue was addressed with improved checks.”

The vulnerability has been tagged as CVE-2023-37450.

So far in 2023, there have been 41 publicly documented cases of zero-day attacks with more than one-fifth (22 percent) affecting software code on Apple devices.

July 11 Update: Apple released Rapid Response Updates for both iOS and macOS, but was forced to pull them after users reported that the patches were breaking some websites.

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Related: Problems Installing Apple’s First iOS Rapid Security Response Patch 

Related: Apple Ships Urgent iOS Patch for Exploited Zero-Days

Related: Apple Fixes Exploited Zero-Day With iOS 16.1 Patch

Related: Apple Says WebKit Zero-Day Hitting iOS, macOS Devices

Written By

Ryan Naraine is Editor-at-Large at SecurityWeek and host of the popular Security Conversations podcast series. He is a security community engagement expert who has built programs at major global brands, including Intel Corp., Bishop Fox and GReAT. Ryan is a founding-director of the Security Tinkerers non-profit, an advisor to early-stage entrepreneurs, and a regular speaker at security conferences around the world.

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