CVE-2021-30779: 
macOS vulnerability analysis and mitigation

CVE-2021-30779 is a security vulnerability in Apple's ImageIO component that was disclosed and patched in July 2021. The vulnerability affects multiple Apple operating systems including iOS 14.7, macOS Big Sur 11.5, watchOS 7.6, and tvOS 14.7. When processing a maliciously crafted image, this vulnerability could lead to arbitrary code execution (Apple Security).

The vulnerability exists in the ImageIO component and was addressed with improved checks. It 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. The vulnerability requires user interaction and local access but could lead to complete compromise of confidentiality, integrity, and availability of the target system (NVD).

If successfully exploited, this vulnerability allows processing of a maliciously crafted image to lead to arbitrary code execution on the affected system. This could potentially allow an attacker to execute malicious code with the privileges of the user running the application (Apple Security).

Apple has addressed this vulnerability by implementing improved checks in the following software updates: iOS 14.7, iPadOS 14.7, macOS Big Sur 11.5, watchOS 7.6, tvOS 14.7, and iCloud for Windows 12.5. Users are advised to update their devices to these versions or later to protect against this vulnerability (Apple Security).