https://arstechnica.com/information-technology/2022/04/zyxel-patches-critical-vulnerability-that-can-allow-firewall-and-vpn-hijacks/

Hardware manufacturer Zyxel has issued patches for a highly critical security flaw that gives malicious hackers the ability to take control of a wide range of firewalls and VPN products the company sells to businesses.

The flaw is an authentication bypass vulnerability that stems from a lack of a proper access-control mechanism in the CGI (common gateway interface) of affected devices, the company said. Access control refers to a set of policies that rely on passwords and other forms of authentication to ensure resources or data are available only to authorized people. The vulnerability is tracked as CVE-2022-0342.