---
id: CVE-2023-39809
title: 'N.V.K.INTER CO., LTD'
summary: >-
  N.V.K.INTER CO., LTD. (NVK) iBSG v3.5 was discovered to contain an OS command
  injection vulnerability via shell metacharacters in the system_hostname
  parameter at /manage/network-basic.php.
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-77
  - CWE-77
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-2023-39809'
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: 0.01493
epssPercentile: 0.73037
ingestedAt: '2026-07-06T16:44:34.230Z'
---

## Overview

N.V.K.INTER CO., LTD. (NVK) iBSG v3.5 was discovered to contain an OS command injection vulnerability via shell metacharacters in the system_hostname parameter at /manage/network-basic.php.

## Affected

- `intelligent_broadband_subscriber_gateway = 3.5`

## Remediation

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