CVE-2021-21132: 
Google Chrome vulnerability analysis and mitigation

Inappropriate implementation in DevTools in Google Chrome prior to version 88.0.4324.96 was identified as CVE-2021-21132. The vulnerability allowed remote attackers to potentially perform a sandbox escape through a crafted Chrome Extension. This security issue was discovered on September 15, 2020, and was publicly disclosed in January 2021 (Chrome Release).

The vulnerability was classified with a CVSS v3.1 Base Score of 9.6 (Critical) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H. This indicates a network-exploitable vulnerability with low attack complexity, requiring no privileges but user interaction, with changed scope and high impacts on confidentiality, integrity, and availability. The vulnerability was categorized under CWE-1021 (Improper Restriction of Rendered UI Layers or Frames) (NVD).

The vulnerability could allow an attacker to escape the Chrome sandbox environment, which is a critical security boundary designed to contain potentially malicious code. A successful exploitation could lead to high impacts on system confidentiality, integrity, and availability, potentially allowing attackers to execute code outside the browser's restricted environment (NVD).

The vulnerability requires user interaction and can be exploited remotely through a crafted Chrome Extension. The attack vector is network-based with low attack complexity, making it relatively straightforward to exploit once the proper conditions are met (NVD).

Google addressed this vulnerability in Chrome version 88.0.4324.96 for Mac and Linux, and version 88.0.4324.104 for Windows. Users are advised to update their Chrome browsers to these versions or later to mitigate the risk (Chrome Release).