Apple has released a new update to patch two zero-day vulnerabilities that allowed attackers to execute malicious code to attack iPhones, iPads, iPods, macOS, and Apple Watch devices.

This update also resolved a bug that prevented users from seeing App Tracking Transparency prompts within apps.

Both vulnerabilities reside in Webkit, a browser engine that renders Web content in Safari, Mail, App Store, and other select apps running on iOS, macOS, and Linux. CVE-2021-30663 and CVE-2021-30665, as the zero-day is tracked, have now been patched. Last week, Apple fixed CVE-2021-30661, another code-execution flaw in iOS Webkit, that also might have been actively exploited.

“Processing maliciously crafted web content may lead to arbitrary code execution,” Apple said in its security notes, referring to the flaws. “Apple is aware of a report that this issue may have been actively exploited.” MacOS 11.3.1, which Apple also released on Monday, also fixed CVE-2021-30663 and CVE-2021-30665.

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