CVE-2020-6393: 
Google Chrome vulnerability analysis and mitigation

CVE-2020-6393 is a security vulnerability discovered in Google Chrome's Blink engine prior to version 80.0.3987.87, disclosed in February 2020. The vulnerability involves insufficient policy enforcement in Blink that allowed a remote attacker to leak cross-origin data through a crafted HTML page (Chrome Blog, NVD).

The vulnerability was identified as a medium severity issue with a CVSS v3.1 base score of 6.5, indicating moderate severity. The vulnerability vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N, which indicates that it is network exploitable, requires low attack complexity, needs no privileges, but does require user interaction (NVD). The issue stems from insufficient policy enforcement in the Blink rendering engine, which could lead to cross-origin data leakage.

The vulnerability allows remote attackers to leak cross-origin data when a user accesses a specially crafted HTML page. This could potentially lead to unauthorized access to sensitive information from other origins, compromising web security boundaries (NVD, Debian Security).

The vulnerability was patched in Chrome version 80.0.3987.87. Users and organizations are advised to upgrade to this version or later to mitigate the risk. Multiple Linux distributions also released security updates to address this vulnerability, including Debian (version 80.0.3987.132-1~deb10u1), Fedora, and Gentoo (Debian Security, Gentoo Security).