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Apple Warns of New Zero-Day Attacks on iOS, macOS

Apple’s problems with zero-day attacks continued this week with news of another mysterious in-the-wild compromise affecting iPhones, iPads and macOS devices.

Apple’s problems with zero-day attacks continued this week with news of another mysterious in-the-wild compromise affecting iPhones, iPads and macOS devices.

News of the latest compromise was included in a one-line mention in an advisory from Apple that documents fixes for a pair of WebKit security flaws that have been exploited on both iPhones and macOS computers.

Apple’s newest iOS/iPadOS 14.5.1 update addresses the following vulnerabilities:


WebKit (CVE-2021-30665) — Processing maliciously crafted web content may lead to arbitrary code execution. A memory corruption issue was addressed with improved state management.  Apple is aware of a report that this issue may have been actively exploited.

WebKit (CVE-2021-30663) – Processing maliciously crafted web content may lead to arbitrary code execution. An integer overflow was addressed with improved input validation. Apple is aware of a report that this issue may have been actively exploited.

A separate advisory documents the two flaws on macOS and recommends Apple customers upgrade immediately to macOS Big Sur 11.3.1.

Related: Apple iOS 14.5 Patches 50 Security Flaws

Related: Apple Patches Under-Attack iOS Zero-Day


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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