Kerlink gateways running KerOS prior to version 5.10 expose their web interface exclusively over HTTP, without HTTPS support. This lack of transport layer security allows a man-in-the-middle attacker to intercept and modify traffic between the client and the device.

A privilege escalation vulnerability was discovered when Single Sign On (SSO) is enabled that could allow an attacker to intercept a valid, authenticated LXCA user’s XCC session if they can convince the user to click on a specially crafted URL.