CVE-2021-1764: 
macOS vulnerability analysis and mitigation

CVE-2021-1764 is a use-after-free vulnerability discovered in Apple's kernel component that was disclosed and patched in January 2021. The vulnerability affects multiple Apple operating systems including macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, watchOS 7.3, tvOS 14.4, iOS 14.4 and iPadOS 14.4 (Apple Support).

The vulnerability is classified as a use-after-free issue in the kernel component that was addressed by Apple through improved memory management. It has been assigned 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:N/I:N/A:H, indicating network accessibility with low attack complexity and no required privileges or user interaction (NVD).

When exploited, this vulnerability allows a remote attacker to cause a denial of service condition on the affected system (Apple Support, Apple Support).

Apple has released security updates to address this vulnerability across multiple platforms. Users should update to macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, watchOS 7.3, tvOS 14.4, iOS 14.4 or iPadOS 14.4 depending on their device (Apple Support).