CVE-2026-36603

8.1 highEPSS 0.2%

High (8.1). EPSS 0.2% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

8.1 high

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 11% of CVEs (scores of 2026-10-31)
CWE: CWE-306
Published: 2026-06-03
Modified: 2026-07-22
Record from: the NVD, synced 2026-10-19

References

https://github.com/Tymbark7372/MERCUSYS-AC12G/blob/master/advisories/CVE-2026-36603.md

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