CVE-2025-52376Public exploitNetwork attack vector

Administrative shell access via unauthenticated Telnet enablement

Published Jul 15, 2025 · Updated Jul 15, 2025

Authentication bypass in Nexxt Solutions NCM-X1800 firmware UV1.2.7 and earlier allows remote attackers to gain administrative shell access. The /web/um_open_telnet.cgi endpoint enables Telnet without checking authentication, after which the service accepts embedded credentials. Network reachability to the management endpoint is sufficient to enable the service and execute arbitrary commands with administrative device privileges.

CVSS severity9.8
Critical
EPSS probability11.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Nexxt Solutions NCM-X1800 firmware UV1.2.7 and earlier allows remote attackers to gain administrative shell access. The /web/um_open_telnet.cgi endpoint enables Telnet without checking authentication, after which the service accepts embedded credentials. Network reachability to the management endpoint is sufficient to enable the service and execute arbitrary commands with administrative device privileges.

The record

CVE
CVE-2025-52376
Published
Jul 15, 2025
Updated
Jul 15, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-287, CWE-798, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
CWE-798Use of Hard-coded Credentials
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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