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Vulnerability record · CVE-2026-36606 · published 3 June 2026

CVE-2026-36606: Hard-coded credentials vulnerability

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.

7.1 CVSS 3.1 High EPSS 0.14% · top 97.1% CWE-798 · Hard-coded credentials Deferred
7.1CVSS 3.1 base score
0.14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
22 Jul 2026Last modified by NVD

Description

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.

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

References

LinkTags
https://github.com/Tymbark7372/MERCUSYS-AC12G/blob/master/advisories/CVE-2026-36606.md

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Source: NIST National Vulnerability Database (record CVE-2026-36606), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.