Apple late Monday shipped an out-of-band iOS update for older iPhones and iPads alongside a warning that a pair of WebKit security vulnerabilities may have been actively exploited.
As is customary, Apple did not provide details on the zero-day attacks, which appear to be aimed at a range of older models of Apple flagship iPhone devices.
The latest iOS 12.5.4 patch covers at least three documented security holes that expose unpatched devices to arbitrary code execution attacks.
According to Apple, two flaws in the WebKit rendering engine could be exploited via booby-trapped web content to execute code on devices running iOS 12.
The two WebKit bugs (CVE-2021-30761 and CVE-2021-30762) are memory corruption and use-after-free issues that Apple says were fixed with improved state management.
“Apple is aware of a report that this issue may have been actively exploited,” the company said. No other details on the nature of the attacks, victim data or IOCs were provided.
The iOS 12.5.4 also fixes a memory corruption issue in the ASN.1 decoder that could expose older iPhone to code execution attacks.