CVE-2026-36606: Mercusys AC12G · Use of Hard-coded Credentials
Source CVE Database V5
Not known to be exploited · CVSS 7.1 High.
Data as of 26 Oct 2026, 17:16 UTC
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 1% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 3 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
AI-suggested
Until an official fix is available, avoid creating or distributing configuration backups in untrusted environments and restrict access to backup files. Consider changing credentials after backup file exposure and monitor for unauthorized access.
Description
The Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 uses a hardcoded single DES key in ECB mode to encrypt configuration backups. This allows an attacker with access to a backup file to decrypt it and recover sensitive credentials such as the admin password, WiFi PSK, and DDNS credentials. The vulnerability has a high severity score of 7.1 and requires local access with low privileges to exploit.