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CRITICAL

CVE-2025-52376

CVSS v3

9.8

CRITICAL

EPSS Score

11.2 %

exploit probability, as of 2026-09-25

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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.

Technical details

Published
2025-07-15
Last Modified
2026-04-15

Frequently asked questions

What is CVE-2025-52376?

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.

Is CVE-2025-52376 actively exploited?

Active exploitation of CVE-2025-52376 has not been confirmed. Its EPSS score was 11.2% on 2026-09-25, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-52376?

CVE-2025-52376 has a CVSS v3 base score of 9.8 (CRITICAL severity).

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