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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History

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: 2026-06-03T16:09:04.378Z

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

Link: CVE-2026-36609

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

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

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

Link: CVE-2026-36609

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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

Weaknesses