CVE-2026-36611: Exposure of Sensitive Information to an Unauthorized Actor

Mercusys AC12G EU V1 with firmware AC12GEUV1200909 returns 128 bytes of uninitialized buffer when receiving POST requests without SOAPAction header on UPnP port 1900, exposing internal memory to unauthenticated adjacent network attackers...

CVE-2026-36608: Unintended Proxy or Intermediary

Mercusys AC12G EU V1 router with firmware AC12GEUV1200909 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 intern...

CVE-2026-36603: Missing Authentication for Critical Function

Mercusys AC12G EU V1 router with firmware AC12GEUV1200909 exposes 15 of 18 UPnP IGD actions without authentication on port 1900, including AddPortMapping and GetExternalIPAddress. UPnP is enabled by default through the admin interface, allowing any unauthenticated LAN device to create arbitrary...

CVE-2026-36602: Exposure of Sensitive Information to an Unauthorized Actor

Mercusys AC12G EU V1 router with firmware AC12GEUV1200909 discloses kernel memory layout via the UPnP GetStatusInfo action. An unauthenticated attacker on the adjacent network can obtain a raw MIPS KSEG0 kernel pointer, revealing kernel memory layout and aiding further exploitation...

CVE-2026-36608

Mercusys AC12G EU V1 router with firmware AC12GEUV1200909 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 intern...

CVE-2026-36608

The Mercusys AC12G (EU) V1 router, running firmware AC12G(EU)_V1_200909 , is vulnerable to a security flaw in the UPnP AddPortMapping functionality. The root cause is that the service incorrectly accepts its own IP address (192.168.1.1 ) or localhost (127.0.0.1 ) as a valid InternalClient . This ...

CVE-2026-36611

Mercusys AC12G EU V1 with firmware AC12GEUV1200909 returns 128 bytes of uninitialized buffer when receiving POST requests without SOAPAction header on UPnP port 1900, exposing internal memory to unauthenticated adjacent network attackers...

CVE-2026-36602

Mercusys AC12G EU V1 router with firmware AC12GEUV1200909 discloses kernel memory layout via the UPnP GetStatusInfo action. An unauthenticated attacker on the adjacent network can obtain a raw MIPS KSEG0 kernel pointer, revealing kernel memory layout and aiding further exploitation...

EUVD-2026-34150

Mercusys AC12G EU V1 with firmware AC12GEUV1200909 returns 128 bytes of uninitialized buffer when receiving POST requests without SOAPAction header on UPnP port 1900, exposing internal memory to unauthenticated adjacent network attackers...

CVE-2026-36603

Mercusys AC12G EU V1 router with firmware AC12GEUV1200909 exposes 15 of 18 UPnP IGD actions without authentication on port 1900, including AddPortMapping and GetExternalIPAddress. UPnP is enabled by default through the admin interface, allowing any unauthenticated LAN device to create arbitrary...

PT-2026-46055

Name of the Vulnerable Software and Affected Versions DD-WRT versions prior to 45724 Description An unsafe strcpy function in the UPnP handling functionality within router/upnp/src/ssdp.c allows an unauthenticated remote attacker to overflow an internal fixed buffer. This issue is triggered via a...

CVE-2026-36611

Mercusys AC12G EU V1 with firmware AC12GEUV1200909 returns 128 bytes of uninitialized buffer when receiving POST requests without SOAPAction header on UPnP port 1900, exposing internal memory to unauthenticated adjacent network attackers...

EUVD-2026-34147

Mercusys AC12G EU V1 router with firmware AC12GEUV1200909 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 intern...

CVE-2026-3871

CVE-2026-3871 describes a buffer overflow in the UPnP DeletePortMapping() command in Zyxel VMG4005-B50B firmware up to 5.13(ABRL.5.4)C0. An adjacent attacker could trigger a temporary DoS affecting UPnP functionality. The exposed impact is the availability of the UPnP service (CVSSv3.1: AV = Adja...

CVE-2026-3871

A buffer overflow vulnerability in the UPnP DeletePortMapping command in Zyxel VMG4005-B50B firmware versions through 5.13ABRL.5.4C0 could allow an adjacent attacker to trigger a temporary denial-of-service DoS condition affecting the UPnP function of the affected device...

CVE-2026-3870

A buffer overflow vulnerability in the UPnP AddPortMapping command in Zyxel VMG4005-B50B firmware versions through 5.13ABRL.5.4C0 could allow an adjacent attacker to trigger a temporary denial-of-service DoS condition affecting the UPnP function of the affected device...

CVE-2026-3870

Zyxel VMG4005-B50B firmware versions up to 5.13(ABRL.5.4)C0 contain a buffer overflow in the UPnP AddPortMapping() command. This vulnerability could allow an adjacent attacker to trigger a temporary denial-of-service (DoS) condition affecting the UPnP function of the device. The available documen...

CVE-2026-3870

A buffer overflow vulnerability in the UPnP AddPortMapping command in Zyxel VMG4005-B50B firmware versions through 5.13ABRL.5.4C0 could allow an adjacent attacker to trigger a temporary denial-of-service DoS condition affecting the UPnP function of the affected device...

CVE-2026-3871: Buffer Copy without Checking Size of Input

A buffer overflow vulnerability in the UPnP DeletePortMapping command in Zyxel VMG4005-B50B firmware versions through 5.13ABRL.5.4C0 could allow an adjacent attacker to trigger a temporary denial-of-service DoS condition affecting the UPnP function of the affected device...

CVE-2026-3870: Buffer Copy without Checking Size of Input

A buffer overflow vulnerability in the UPnP AddPortMapping command in Zyxel VMG4005-B50B firmware versions through 5.13ABRL.5.4C0 could allow an adjacent attacker to trigger a temporary denial-of-service DoS condition affecting the UPnP function of the affected device...