CVE-2021-30653: 
macOS vulnerability analysis and mitigation

CVE-2021-30653 is a security vulnerability that affects multiple Apple operating systems including macOS Big Sur 11.3, iOS 14.5, iPadOS 14.5, watchOS 7.4, and tvOS 14.5. The vulnerability was discovered by Ye Zhang of Baidu Security and was fixed in updates released on April 26, 2021. The issue affects the ImageIO component and involves processing maliciously crafted images that could lead to arbitrary code execution (Apple Support).

The vulnerability exists in the ImageIO component of affected Apple operating systems. The issue was addressed with improved checks to prevent arbitrary code execution when processing maliciously crafted images. The vulnerability has a CVSS v3.1 base score of 7.8 (HIGH) with the vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, indicating local access is required with user interaction (NVD).

If exploited, this vulnerability could allow an attacker to execute arbitrary code on the affected system through processing a maliciously crafted image. This could potentially lead to unauthorized access and control of the affected device (Apple Support).

Apple has addressed this vulnerability by implementing improved checks in the following software updates: macOS Big Sur 11.3, iOS 14.5, iPadOS 14.5, watchOS 7.4, and tvOS 14.5. Users are advised to update their devices to these versions or later to protect against this vulnerability (Apple Support).