CVE-2021-1738: 
macOS vulnerability analysis and mitigation

CVE-2021-1738 is a security vulnerability discovered in Apple's ImageIO component that affects multiple Apple operating systems including macOS Big Sur, iOS, and iPadOS. The vulnerability was disclosed and patched in January 2021, with fixes released in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, iOS 14.4, and iPadOS 14.4 (Apple Security, Apple iOS).

The vulnerability is classified as an out-of-bounds write issue in the ImageIO component. The flaw was addressed by Apple through improved input validation mechanisms. 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).

When exploited, processing a maliciously crafted image could lead to arbitrary code execution on the affected system. This could potentially allow attackers to execute unauthorized code and compromise the security of the affected device (Apple Security).

Apple has released security updates to address this vulnerability in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, iOS 14.4, and iPadOS 14.4. Users are advised to update their systems to these versions or later to mitigate the risk (Apple Security).