Unpatched Calix NAT bypass risk exposes internal devices
🔒 An unpatched authentication flaw in Calix GS7 XGS (GS5239XG) residential gateways running EXOS/6.6.47 lets remote unauthenticated attackers create and manipulate port-forwarding rules via the MiniUPnPd control endpoint on TCP port 5000. Researcher Brian Khan Quintana reported the issue as CVE-2026-75501 after failed vendor notification and worked with CERT/CC for disclosure. Exploitation can permanently open firewall rules that expose internal cameras, NAS, IoT devices, and admin interfaces; users are advised to disable UPnP or contact their ISP if the setting is locked.
