CVE-2026-36611

High severity, CVSS 7.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Mercusys AC12G (EU) V1 with firmware AC12G(EU)_V1_200909 returns 128 bytes of uninitialized buffer when receiving POST requests without SOAPAction header on UPnP port 1900, exposing internal memory to unauthenticated adjacent network attackers.

Published 2026-06-03. Last modified 2026-07-22.