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Vulnerability record · CVE-2025-52376 · published 15 July 2025

CVE-2025-52376: Improper authentication vulnerability

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.

9.8 CVSS 3.1 Critical EPSS 11% · top 4.2% CWE-287 · Improper authenticationCWE-798 · Hard-coded credentials Deferred
9.8CVSS 3.1 base score
11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://github.com/Vagebondcur/nexxt-solutions-NCM-X1800-exploits
https://github.com/Vagebondcur/nexxt-solutions-NCM-X1800-exploits/blob/main/CVE-2025-52376/writeup.md

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-52376), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.