CVE-2021-30563: 
vulnerability analysis and mitigation

Type Confusion vulnerability (CVE-2021-30563) was discovered in Google Chrome's V8 JavaScript engine prior to version 91.0.4472.164. The vulnerability was reported on July 12, 2021, and a patch was released on July 15, 2021. This security flaw affected Chrome browsers across Windows, Mac, and Linux operating systems (Chrome Release).

The vulnerability is classified as a Type Confusion bug in V8, Google's open-source C++-based and high-performance WebAssembly and JavaScript engine. It received a CVSS v3.1 base score of 8.8 (HIGH) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. The vulnerability is identified under CWE-843 (Access of Resource Using Incompatible Type) (NVD).

Type confusion vulnerabilities typically lead to browser crashes by reading or writing memory out of buffer bounds. However, this vulnerability could be exploited by attackers to execute arbitrary code on affected systems. The high CVSS score indicates potential severe impacts on system confidentiality, integrity, and availability (Bleeping Computer).

Google released Chrome version 91.0.4472.164 to address this vulnerability. Users are advised to update their Chrome browsers immediately. The browser will automatically update itself on the next launch, but users can also manually check for updates through Settings > Help > 'About Google Chrome' (Chrome Release).