Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 uses a static authentication nonce that does not change between requests from the same source IP. Combined with the predictable XOR-based password encoding (securityEncode function), this allows an attacker to reverse captured authentication tokens to recover the plaintext password.

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Solution

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History

Wed, 03 Jun 2026 20:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-327
CWE-341
Metrics cvssV3_1

{'score': 7.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 03 Jun 2026 18:45:00 +0000

Type Values Removed Values Added
Title Static Nonce and Predictable XOR Encoding Enable Recovery of Plaintext Passwords on Mercusys AC12G Router
Weaknesses CWE-326

Wed, 03 Jun 2026 17:45:00 +0000

Type Values Removed Values Added
Description Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 uses a static authentication nonce that does not change between requests from the same source IP. Combined with the predictable XOR-based password encoding (securityEncode function), this allows an attacker to reverse captured authentication tokens to recover the plaintext password.
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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-06-03T19:38:09.934Z

Reserved: 2026-04-06T00:00:00.000Z

Link: CVE-2026-36609

cve-icon Vulnrichment

Updated: 2026-06-03T19:38:03.249Z

cve-icon NVD

Status : Received

Published: 2026-06-03T18:16:22.063

Modified: 2026-06-03T20:16:19.557

Link: CVE-2026-36609

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-03T18:30:36Z

Weaknesses