CVE-2026-36609

HighCVSS 7.3/10Last modified Jul 22, 2026

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.

Metrics

CVSS 3.1 7.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Weakness enumeration

CWE-327 CWE-341

Affected software

No affected versions have been published.

Timeline

Published: Jun 3, 2026
Last modified: Jul 22, 2026
NVD status: Deferred

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