CVE-2023-39809Public exploitNetwork attack vector

Root command execution via unsanitized hostname parameter

Published Aug 21, 2023 · Updated Jul 9, 2026

OS command injection in NVK iBSG 3.5 allows remote authenticated users to execute commands as root through the admin web portal. The /manage/network-basic.php endpoint passes shell metacharacters from system_hostname into command execution even though only the browser-side field filters input. An iBSG administrator account and direct request manipulation are required; successful injection runs with root privileges and can fully alter or interrupt the gateway.

CVSS severity9.8
Critical
EPSS probability1.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in NVK iBSG 3.5 allows remote authenticated users to execute commands as root through the admin web portal. The /manage/network-basic.php endpoint passes shell metacharacters from system_hostname into command execution even though only the browser-side field filters input. An iBSG administrator account and direct request manipulation are required; successful injection runs with root privileges and can fully alter or interrupt the gateway.

The record

CVE
CVE-2023-39809
Published
Aug 21, 2023
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, CAPEC-15, CAPEC-248, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CAPEC-15Command Delimiters
CAPEC-248Command Injection
T1059.004Command and Scripting Interpreter: Unix Shell

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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