CVE-2021-1783: 
macOS vulnerability analysis and mitigation

CVE-2021-1783 is a security vulnerability discovered in Apple's ImageIO component that was disclosed and patched in January 2021. The vulnerability affects multiple Apple operating systems including macOS Big Sur 11.2, iOS 14.4, iPadOS 14.4, watchOS 7.3, and tvOS 14.4. It was discovered by Xingwei Lin of Ant Security Light-Year Lab (Apple Security).

The vulnerability is an access issue in the ImageIO component that could be exploited when processing maliciously crafted images. The issue was addressed by Apple with improved memory management. 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 (NVD).

Processing a maliciously crafted image may lead to arbitrary code execution on affected systems. This means an attacker could potentially execute malicious code with the privileges of the user running the application that processes the image (Apple Security).

Apple addressed this vulnerability in the following operating system updates: macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, watchOS 7.3, tvOS 14.4, iOS 14.4 and iPadOS 14.4. Users should update their devices to these versions or later to protect against this vulnerability (Apple Security).