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CVE-2026-36604 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:6.1 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CNA: CISA-ADPCVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/Tymbark7372/MERCUSYS-AC12G/blob/master/advisories/CVE-2026-36604.md	[email protected]	AdvisoryBundleRemedy

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-350	Reliance on Reverse DNS Resolution for a Security-Critical Action	CISA-ADP

Affected Products

Product	Versions
Mercusys AC12G	AC12G(EU)_V1_200909 AC12G(EU)_V1_210128
CPE No CPEs found in CPE dictionary for this product. Remediation Workaround:low effort Configure the DNS resolver to block private IP addresses in responses. Workaround:low effort Validate the Host header against the router's configured hostname and IP addresses. Workaround:low effort Remove the Access-Control-Allow-Origin: * header from all responses.

Change History

5 change records found show changes

Date	Action	Recorded By
Jul 22, 2026	CVE Translated	[email protected]
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Jun 3, 2026	CVE Modified	CISA-ADP
Jun 3, 2026	New CVE Received	[email protected]