CVE-2021-30660: 
macOS vulnerability analysis and mitigation

CVE-2021-30660 is a kernel vulnerability discovered in Apple operating systems that was fixed in macOS Big Sur 11.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, and tvOS 14.5, released in April 2021. The vulnerability involves an out-of-bounds read issue in the kernel that was addressed with improved bounds checking. When exploited, this vulnerability allows a malicious application to disclose kernel memory (Apple Support, CVE).

The vulnerability is classified as an out-of-bounds read vulnerability (CWE-125) in the kernel component. It received a CVSS v3.1 base score of 7.5 (HIGH) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N, indicating network accessibility, low attack complexity, no privileges required, and high confidentiality impact (NVD).

The primary impact of this vulnerability is the potential disclosure of kernel memory. A malicious application could exploit this vulnerability to access sensitive information stored in kernel memory, potentially leading to information disclosure and privacy violations (Apple Support).

Apple addressed this vulnerability by implementing improved bounds checking in the affected systems. Users should update their devices to the following versions: macOS Big Sur 11.3 or later, iOS 14.5 or later, iPadOS 14.5 or later, watchOS 7.4 or later, and tvOS 14.5 or later (Apple Support).