CVE-2026-36609

7.3 highEPSS 0.2%

High (7.3). EPSS 0.2% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

7.3 high

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

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 5% of CVEs (scores of 2026-10-31)
CWEs: CWE-327, CWE-341
Published: 2026-06-03
Modified: 2026-07-22
Record from: the NVD, synced 2026-10-19

References

https://github.com/Tymbark7372/MERCUSYS-AC12G/blob/master/advisories/CVE-2026-36609.md

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