CVE-2021-30787: 
macOS vulnerability analysis and mitigation

CVE-2021-30787 is a security vulnerability affecting the Intel Graphics Driver component in Apple's macOS operating systems. The vulnerability was discovered by an anonymous researcher working with Trend Micro Zero Day Initiative and was fixed in macOS Big Sur 11.5, Security Update 2021-004 Catalina, and Security Update 2021-005 Mojave, released on July 21, 2021 (Apple Support).

The vulnerability exists in the Intel Graphics Driver component where an application may be able to cause unexpected system termination or write kernel memory. The issue was addressed with improved checks in the affected systems. 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).

If exploited, this vulnerability could allow an application to cause unexpected system termination or write to kernel memory, potentially leading to system crashes or arbitrary code execution with kernel privileges (Apple Support).

Apple has addressed this vulnerability by implementing improved checks in the following security updates: macOS Big Sur 11.5, Security Update 2021-004 Catalina, and Security Update 2021-005 Mojave. Users are advised to update their systems to these versions or later to mitigate the vulnerability (Apple Support).