CVE-2020-3850: 
macOS vulnerability analysis and mitigation

CVE-2020-3850 is a memory corruption vulnerability discovered in Apple's CoreBluetooth component that affects macOS systems. The vulnerability was fixed in macOS Catalina 10.15.3, released on January 28, 2020. The issue was discovered by Jianjun Dai of Qihoo 360 Alpha Lab (Apple Advisory).

The vulnerability stems from a memory corruption issue in the CoreBluetooth component that was addressed with improved input validation. The vulnerability has received a CVSS v3.1 base score of 9.8 (CRITICAL) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating it can be exploited remotely with no privileges or user interaction required (NVD).

A successful exploitation of this vulnerability could allow a remote attacker to cause unexpected application termination or execute arbitrary code on the target system. The high severity score indicates potential complete compromise of system confidentiality, integrity, and availability (Apple Advisory, NVD).

The vulnerability affects macOS Mojave 10.14.6, macOS High Sierra 10.13.6, and macOS Catalina versions prior to 10.15.3. The low attack complexity and no required privileges make this vulnerability highly exploitable (NVD).

Apple addressed this vulnerability by improving input validation in macOS Catalina 10.15.3, Security Update 2020-001 Mojave, and Security Update 2020-001 High Sierra. Users are advised to update to these versions or later to mitigate the risk (Apple Advisory).