CVE-2026-36609

—

CVSS 3.1

7.3 high

EPSS

<1%p6

Published

Jun 3, 2026 (Jun 3, 2026)

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.

Weakness: CWE-327, CWE-341
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

NVD CVE.org GitHub PoCs EPSS (0.2%)

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