CVE-2021-30916: 
macOS vulnerability analysis and mitigation

CVE-2021-30916 is a memory corruption vulnerability discovered in Apple's operating systems. The vulnerability was disclosed and patched in October 2021, affecting multiple Apple products including iOS 15.1, iPadOS 15.1, macOS Monterey 12.0.1, iOS 14.8.1, iPadOS 14.8.1, Security Update 2021-007 Catalina, and macOS Big Sur 11.6.1. The vulnerability was discovered by Zweig of Kunlun Lab (Apple Support).

The vulnerability is classified as a memory corruption issue in the kernel component that was addressed with improved memory handling. It received 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 requirements with low attack complexity (NVD).

When exploited, this vulnerability allows a malicious application to execute arbitrary code with kernel privileges, potentially giving an attacker complete control over the affected device (Apple Support, Apple Support).

Apple addressed this vulnerability by releasing security updates across multiple operating system versions. The fix was implemented through improved memory handling in the kernel component. Users should update to iOS 15.1, iPadOS 15.1, macOS Monterey 12.0.1, iOS 14.8.1, iPadOS 14.8.1, Security Update 2021-007 Catalina, or macOS Big Sur 11.6.1 depending on their device (Apple Support).