CVE-2021-1761: 
macOS vulnerability analysis and mitigation

CVE-2021-1761 is a security vulnerability that affects multiple Apple operating systems including iOS 14.4, iPadOS 14.4, macOS Big Sur 11.2, watchOS 7.3, and tvOS 14.4. The vulnerability was discovered by Cees Elzinga and disclosed in January 2021. When exploited, a remote attacker may be able to cause a denial of service on affected systems (Apple Support, Apple Security).

The vulnerability exists in the Analytics component of affected Apple operating systems. The security issue was addressed by Apple through improved checks in their systems. The vulnerability has a CVSS v3.1 Base Score of 7.5 (HIGH) with the following vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (NVD).

The primary impact of this vulnerability is the potential for a remote attacker to cause a denial of service on affected systems. This could result in system unavailability or disruption of services (Apple Support).

The vulnerability can be exploited remotely by an attacker without requiring user interaction or special privileges. The attack complexity is considered low, making it relatively straightforward to exploit (NVD).

Apple has released security updates to address this vulnerability in iOS 14.4, iPadOS 14.4, macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, watchOS 7.3, and tvOS 14.4. Users are advised to update their devices to these versions to protect against potential attacks (Apple Support, Apple Security).