{"id":59533,"date":"2025-07-21T07:19:36","date_gmt":"2025-07-21T07:19:36","guid":{"rendered":""},"modified":"2025-10-03T12:32:44","modified_gmt":"2025-10-03T18:32:44","slug":"cve-2025-52376-authentication-bypass-vulnerability-in-nexxt-solutions-ncm-x1800-mesh-router","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-52376-authentication-bypass-vulnerability-in-nexxt-solutions-ncm-x1800-mesh-router\/","title":{"rendered":"CVE-2025-52376: Authentication Bypass Vulnerability in Nexxt Solutions NCM-X1800 Mesh Router<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

CVE-2025-52376 represents a severe vulnerability that affects the firmware of the Nexxt Solutions NCM-X1800 Mesh Router. It exposes a loophole in the \/web\/um_open_telnet.cgi endpoint, allowing unauthorized access to the Telnet service without authentication. This exploit can provide the attacker with administrative shell access and the ability to execute arbitrary commands<\/a> on the device.
\nThis vulnerability is highly concerning due to its potential<\/a> impact on both individual users and corporations. With unauthorized access, an attacker can compromise the system, leading to potential data leakage or total system control<\/a>. Therefore, understanding and mitigating this vulnerability is of utmost importance for cybersecurity<\/a>.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-52376
\nSeverity: Critical (9.8 CVSS score)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: Potential system compromise<\/a> and data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Nexxt Solutions NCM-X1800 Mesh Router | firmware UV1.2.7 and below<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The vulnerability resides in the \/web\/um_open_telnet.cgi endpoint of the Nexxt Solutions NCM-X1800 Mesh<\/a> Router firmware. An attacker can exploit this vulnerability by sending a specific network request<\/a> to this endpoint. Upon receiving the request, the router unintentionally enables the Telnet service, bypassing any security controls<\/a>.
\nThe Telnet server, once enabled, is accessible with hard-coded credentials<\/a>, providing an attacker with administrative shell access on the device. This level of access allows the attacker to execute arbitrary commands<\/a>, potentially compromising the entire system.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Below is a conceptual HTTP request example that an attacker might employ to exploit<\/a> the vulnerability:<\/p>\n

GET \/web\/um_open_telnet.cgi HTTP\/1.1\nHost: target_router_ip<\/code><\/pre>\n
Once the Telnet service<\/a> is enabled, an attacker can log in using hard-coded credentials:<\/p>\n
telnet target_router_ip\nUsername: admin\nPassword: admin<\/code><\/pre>\n
The above example is only conceptual and does not represent actual exploit code. The actual payload would depend on the specific device configuration and the goals of the attacker.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview CVE-2025-52376 represents a severe vulnerability that affects the firmware of the Nexxt Solutions NCM-X1800 Mesh Router. It exposes a loophole in the \/web\/um_open_telnet.cgi endpoint, allowing unauthorized access to the Telnet service without authentication. This exploit can provide the attacker with administrative shell access and the ability to execute arbitrary commands on the device. This […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[75],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-59533","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-authentication-bypass"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t