CVE-2021-30777: 
macOS vulnerability analysis and mitigation

CVE-2021-30777 is an injection vulnerability discovered in Apple's macOS operating system that was disclosed and patched in July 2021. The vulnerability affects multiple versions of macOS including Big Sur, Catalina, and Mojave. When exploited, this vulnerability allows a malicious application to gain root privileges through an injection issue in the CoreStorage component (Apple Security, Apple Advisory).

The vulnerability is an injection issue in the CoreStorage component of macOS that was addressed with improved validation. It has been assigned 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 is required and user interaction is needed, but no privileges are required to exploit (NVD Database).

If successfully exploited, this vulnerability allows a malicious application to gain root privileges on the affected system, potentially giving an attacker complete control over the compromised machine (Apple Security).

Apple has released patches for this vulnerability in macOS Big Sur 11.5, Security Update 2021-004 Catalina, and Security Update 2021-005 Mojave. Users should update their systems to these versions or later to protect against this vulnerability (Apple Security).

The vulnerability was discovered and reported by Tim Michaud of Zoom Video Communications and Gary Nield of ECSC Group plc, demonstrating collaborative security research between different organizations (Apple Security).