PT-2026-45997 · Undefined · Undefined

Tymbark7372 · Published 2026-06-03 · Updated 2026-06-03 · CVE-2026-36609

Mitre

CVSS v3.1

7.3

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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.

Exploit

Fix

Use of a Broken Cryptographic Algorithm

Weakness Enumeration

CWE-341

CWE-327

Related Identifiers

CVE-2026-36609

Affected Products

Undefined

References · 2

• 🔥 https://github.com/Tymbark7372/MERCUSYS-AC12G/blob/master/advisories/CVE-2026-36609.md · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-36609 · Security Note