High severity8.1NVD Advisory· Published Jun 3, 2026· Updated Jun 5, 2026
CVE-2026-36603
CVE-2026-36603
Description
Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 exposes 15 of 18 UPnP IGD actions without authentication on port 1900, including AddPortMapping and GetExternalIPAddress. UPnP is enabled by default through the admin interface, allowing any unauthenticated LAN device to create arbitrary port forwarding rules and access WAN traffic statistics.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
1Patches
Vulnerability mechanics
References
1News mentions
1- Mercusys AC12G Router: 15 Vulnerabilities Disclosed on June 3, 2026Vypr Intelligence · Jun 3, 2026