CVE-2025-52376

Critical severity, CVSS 9.8. EPSS: 11.8% chance of exploitation in the next 30 days.

An authentication bypass vulnerability in the /web/um_open_telnet.cgi endpoint in Nexxt Solutions NCM-X1800 Mesh Router firmware UV1.2.7 and below, allowing an attacker to remotely enable the Telnet service without authentication, bypassing security controls. The Telnet server is then accessible with hard-coded credentials, allowing attackers to gain administrative shell access and execute arbitrary commands on the device.

Published 2025-07-15. Last modified 2026-06-17.