CVE-2021-21182: 
Google Chrome vulnerability analysis and mitigation

CVE-2021-21182 is a security vulnerability discovered in Google Chrome versions prior to 89.0.4389.72. The vulnerability involves insufficient policy enforcement in navigations that allowed a remote attacker who had compromised the renderer process to bypass navigation restrictions via a crafted HTML page. This vulnerability was reported by Luan Herrera (@lbherrera_) and was disclosed in March 2021 (Chrome Release).

The vulnerability is classified as Low severity with a CVSS v3.1 Base Score of 6.5 (Medium). The vulnerability stems from improper implementation of navigation policy controls in the Chrome browser, which could allow an attacker to bypass intended navigation restrictions if they have already compromised the renderer process. The attack requires user interaction and network access (NVD).

If successfully exploited, this vulnerability could allow an attacker who has already compromised the renderer process to bypass navigation restrictions, potentially leading to unauthorized navigation to restricted pages or resources. The impact is limited to integrity violations, with no direct effect on confidentiality or availability (NVD).

The vulnerability was patched in Google Chrome version 89.0.4389.72. Users and administrators are advised to upgrade to this version or later to mitigate the risk. The fix was also incorporated into various Linux distributions including Debian, Fedora, and Gentoo through their respective security updates (Debian Security, Gentoo Security).