---
id: CVE-2023-39808
title: 'N.V.K.INTER CO., LTD'
summary: >-
  N.V.K.INTER CO., LTD. (NVK) iBSG v3.5 was discovered to contain a hardcoded
  root password that allows attackers to login with root privileges via the SSH
  service. The cleartext password corresponding to the
  $1$4Tmm01jl$7HRvcW.bz7uGmX9hiQ…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-798
vendor: nvki
product: intelligent_broadband_subscriber_gateway
affected:
  - intelligent_broadband_subscriber_gateway = 3.5
published: '2023-08-21'
updated: '2026-07-05'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-39808'
references:
  - url: 'https://github.com/maride'
    label: cve@mitre.org
  - url: 'https://sec.maride.cc/posts/ibsg/'
    label: cve@mitre.org
  - url: 'http://ibsg.com'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://nvkinter.com'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00645
epssPercentile: 0.48666
ingestedAt: '2026-07-06T16:44:34.228Z'
---

## Overview

N.V.K.INTER CO., LTD. (NVK) iBSG v3.5 was discovered to contain a hardcoded root password that allows attackers to login with root privileges via the SSH service. The cleartext password corresponding to the $1$4Tmm01jl$7HRvcW.bz7uGmX9hiQWvR hash was not determined by the vulnerability discoverer.

## Affected

- `intelligent_broadband_subscriber_gateway = 3.5`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.