Denial-of-service (DoS) vulnerability due to a stack buffer overflow in the httpgdprdecrypt function of the Mercusys MB115-4G device's web interface. An unauthenticated attacker could exploit this vulnerability by sending a specially crafted request to the /cgi/login endpoint, causing memory corruption and the httpd process to crash, resulting in a denial of service for the web administration service.

Mercusys AC12G (EU) V1 with firmware AC12G(EU)V1200909 transmits DDNS credentials over plaintext HTTP with only Base64 encoding. The firmware contains no TLS implementation, allowing man-in-the-middle interception of DDNS service credentials.

Mercusys AC12G (EU) V1 router with firmware AC12G(EU)V1200909 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.

Mercusys AC12G (EU) V1 router with firmware AC12G(EU)V1200909 encrypts configuration backups with a hardcoded DES key using single DES in ECB mode. An attacker who obtains a backup file can decrypt it to recover all stored credentials including admin password, WiFi PSK, and DDNS credentials.

Mercusys AC12G (EU) V1 with firmware AC12G(EU)V1200909 returns 128 bytes of uninitialized internal buffer contents when receiving HTTP POST requests to undefined paths, exposing server state to unauthenticated adjacent network attackers.

Mercusys AC12G (EU) V1 with firmware AC12G(EU)V1200909 exposes an undocumented /agileconfigreset endpoint that returns internal buffer contents to unauthenticated attackers on the adjacent network.

Mercusys AC12G (EU) V1 router with firmware AC12G(EU)V1200909 is vulnerable to a HTTP denial of service via a low number of crafted incomplete HTTP requests, causing a persistent crash that requires physical power cycling to recover.

Mercusys AC12G (EU) V1 router with firmware AC12G(EU)V1200909 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 port forwarding rules and access WAN traffic statistics.

Mercusys AC12G (EU) V1 router with firmware AC12G(EU)V1200909 allows unauthenticated brute-force attacks via the TDDP password change endpoint (code=10), which lacks the rate limiting applied to the login endpoint (code=7). An attacker on the adjacent network can attempt unlimited passwords without triggering account lockout.

Mercusys AC12G (EU) V1 with firmware AC12G(EU)V1200909 responds to version.bind CHAOS TXT queries, disclosing the DNS resolver software version (unbound 1.22.0), aiding targeted attacks against known vulnerabilities.

Mercusys AC12G (EU) V1 with firmware AC12G(EU)V1200909 contains hardcoded WiFi driver credentials including a RADIUS shared secret, WPS test key, and default PSK embedded in the production firmware binary.

Mercusys AC12G (EU) V1 router with firmware AC12G(EU)V1200909 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.

Mercusys AC12G (EU) V1 router with firmware AC12G(EU)V1200909 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.

Mercusys AC12G (EU) V1 with firmware AC12G(EU)V1200909 enables WPS 2.0 by default with a weak lockout policy (60-second lockout after 10 attempts).

Mercusys AC12G (EU) V1 router with firmware AC12G(EU)V1200909 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.

Mercusys AC12G (EU) V1 with firmware AC12G(EU)V1200909 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.

Mercusys MW305R 3.30 and below is has a Transport Layer Security (TLS) certificate private key disclosure.

A vulnerability was found in Mercusys MW301R 1.0.2 Build 190726 Rel.59423n. It has been rated as problematic. This issue affects some unknown processing of the component Login. The manipulation leads to improper restriction of excessive authentication attempts. The attack can only be initiated within the local network. The complexity of an attack is rather high. The exploitation is known to be difficult. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

A vulnerability was found in Mercusys MW301R 1.0.2 Build 190726 Rel.59423n. It has been declared as problematic. This vulnerability affects unknown code of the component Web Interface. The manipulation of the argument code leads to weak password recovery. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Mercusys MW325R EU V3 (Firmware MW325R(EU)V31.11.0 Build 221019) is vulnerable to a stack-based buffer overflow, which could allow an attacker to execute arbitrary code. Exploiting the vulnerability requires authentication.

An issue was discovered on Mercusys MW325R EU V3 MW325R(EU)V31.11.0 221019 devices. A WAN attacker can make the admin interface unreachable/invisible via an unauthenticated HTTP request. Verification of the data sent by the user does not occur. The web server does not crash, but the admin interface becomes invisible, because the files necessary to display the content are no longer available. A reboot of the router is typically required to restore the correct behavior.

TP-Link TL-WDR7660 2.0.30, Mercury D196G 202001092.0.4, and Fast FAC1900R 201908272.0.2 routers have a stack overflow issue in MntAte function. Local users could get remote code execution.

TP-Link TL-WDR7660 2.0.30, Mercury D196G 202001092.0.4, and Fast FAC1900R 201908272.0.2 routers have a stack overflow issue in MmtAtePrase function. Local users could get remote code execution.

MERCUSYS Mercury X18G 1.0.5 devices allow Denial of service via a crafted value to the POST listenhttplan parameter. Upon subsequent device restarts after this vulnerability is exploted the device will not be able to access the webserver unless the listenhttplan parameter to uhttpd.json is manually fixed.

Cross site Scripting (XSS) vulnerability in MERCUSYS Mercury X18G 1.0.5 devices, via crafted values to the 'srcdportstart', 'srcdportend', and 'destport' parameters.

MERCUSYS Mercury X18G 1.0.5 devices allow Directory Traversal via ../ in conjunction with a loginLess or login.htm URI (for authentication bypass) to the web server, as demonstrated by the /loginLess/../../etc/passwd URI.

MERCUSYS Mercury X18G 1.0.5 devices allow Directory Traversal via ../ to the UPnP server, as demonstrated by the /../../conf/template/uhttpd.json URI.