Mercusys AC12G (EU) V1 router with firmware AC12G(EU)_V1_200909 allows UPnP AddPortMapping to forward external ports to the router's own admin interface by accepting its own IP (192.168.1.1) or localhost (127.0.0.1) as InternalClient. An unauthenticated LAN attacker can expose the admin panel to the internet with a single SOAP request.
History

Fri, 05 Jun 2026 10:45:00 +0000

Type Values Removed Values Added
First Time appeared Mercusys
Mercusys ac12g
Vendors & Products Mercusys
Mercusys ac12g

Wed, 03 Jun 2026 23:15:00 +0000

Type Values Removed Values Added
Title Router Admin Interface Exposed to Internet via UPnP AddPortMapping

Wed, 03 Jun 2026 21:15:00 +0000

Type Values Removed Values Added
Title Unauthenticated WAN Exposure of Router Admin Interface via UPnP AddPortMapping
Weaknesses CWE-20

Wed, 03 Jun 2026 19:15:00 +0000

Type Values Removed Values Added
Title Unauthenticated WAN Exposure of Router Admin Interface via UPnP AddPortMapping
Weaknesses CWE-20
CWE-441
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


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 allows UPnP AddPortMapping to forward external ports to the router's own admin interface by accepting its own IP (192.168.1.1) or localhost (127.0.0.1) as InternalClient. An unauthenticated LAN attacker can expose the admin panel to the internet with a single SOAP request.
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2026-06-03T00:00:00.000Z

Updated: 2026-06-03T18:34:27.788Z

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

Link: CVE-2026-36608

cve-icon Vulnrichment

Updated: 2026-06-03T18:34:18.015Z

cve-icon NVD

Status : Deferred

Published: 2026-06-03T18:16:21.923

Modified: 2026-06-04T15:41:35.193

Link: CVE-2026-36608

cve-icon Redhat

No data.