CVE-2025-52376 | An authentication bypass vulnerability in the /web/um_open_t… | CVSS 9.8 CRITICAL

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.

Metadata

CVE ID: CVE-2025-52376
State: PUBLISHED
Assigner: mitre
Reserved: 2025-06-16 00:00 UTC
Published: 2025-07-15 00:00 UTC
Last updated: 2025-07-15 14:23 UTC
Primary CWE: CWE-287
CWE-287 Improper Authentication
Vendor / Product: n/a / n/a
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
n/a	n/a	—	n/a

Weakness (CWE)

CWE	Source	Description
—	cna	n/a
CWE-287	adp	CWE-287 Improper Authentication
CWE-798	adp	CWE-798 Use of Hard-coded Credentials

CVSS scores (1)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	adp	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References (2)