CVE-2026-36604

MEDIUM

Mercusys AC12G (EU) V1 AC12G(EU)_V1_200909 - DNS Rebinding via HTTP Host Header

Title source: llm

Description

Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 does not validate the HTTP Host header, enabling DNS rebinding attacks. An external attacker can rebind a domain to the router's internal IP address, extending the CORS wildcard vulnerability (Access-Control-Allow-Origin: *) to internet-originated attacks.

References (1)

Core 1

Core References

https://github.com/Tymbark7372/MERCUSYS-AC12G/blob/master/advisories/CVE-2026-36604.md

View Writeup ZIP pw:eip

Scores

CVSS v3 6.5

EPSS 0.0025

EPSS Percentile 16.5%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact partial

Details

CWE

CWE-350

Status published

Published Jun 03, 2026

Tracked Since Jun 03, 2026