CVE-2021-4059: 
vulnerability analysis and mitigation

CVE-2021-4059 is a security vulnerability discovered in Google Chrome prior to version 96.0.4664.93. The vulnerability stems from insufficient data validation in the browser's loader component, which could allow a remote attacker to leak cross-origin data through a specially crafted HTML page (Chrome Blog, NVD).

The vulnerability has been assigned a CVSS v3.1 base score of 6.5 (Medium), with the following vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N. This indicates that the vulnerability can be exploited remotely, requires low attack complexity, needs no privileges, but does require user interaction. The scope is unchanged, with potential high impact on confidentiality but no impact on integrity or availability (NVD).

The primary impact of this vulnerability is the potential leakage of cross-origin data. An attacker could exploit this vulnerability to access data from different origins than intended, potentially compromising sensitive information through cross-origin data leaks (Chrome Blog).

The vulnerability was patched in Google Chrome version 96.0.4664.93. Users and organizations are advised to update to this version or later to mitigate the risk. The fix has also been incorporated into various Linux distributions, including Debian 11 (Bullseye) in version 97.0.4692.71-0.1~deb11u1, and Fedora 34 (Debian Advisory, Fedora Update).