CVE-2026-36606

High severity, CVSS 7.1. EPSS: 0.1% chance of exploitation in the next 30 days.

Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 encrypts configuration backups with a hardcoded DES key using single DES in ECB mode. An attacker who obtains a backup file can decrypt it to recover all stored credentials including admin password, WiFi PSK, and DDNS credentials.

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