How severe is CVE-2023-39808?

CVE-2023-39808 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-39808 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-39808?

CVE-2023-39808 affects Nvki Intelligent Broadband Subscriber Gateway. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-39808?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-39808 published?

CVE-2023-39808 was published on 2023-08-21 and last updated on 2026-07-09.

CVE-2023-39808

CVE-2023-39808 is a critical-severity vulnerability in Nvki Intelligent Broadband Subscriber Gateway with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-798.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-798
Affected product: Nvki Intelligent Broadband Subscriber Gateway
Published: 2023-08-21
Last modified: 2026-07-09

Description

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.

Frequently asked questions

What is CVE-2023-39808?: 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.
How severe is CVE-2023-39808?: CVE-2023-39808 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-39808 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-39808?: CVE-2023-39808 affects Nvki Intelligent Broadband Subscriber Gateway. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-39808?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-39808 published?: CVE-2023-39808 was published on 2023-08-21 and last updated on 2026-07-09.

References

Affected products (1)

cpe:2.3:a:nvki:intelligent_broadband_subscriber_gateway:3.5:*:*:*:*:*:*:*

More vulnerabilities in Nvki Intelligent Broadband Subscriber Gateway

CVE-2023-39809 — Critical (CVSS 9.8): N.V.K.INTER CO., LTD. (NVK) iBSG v3.5 was discovered to contain an OS command injection vulnerability via shell…
CVE-2023-39807 — Critical (CVSS 9.8): N.V.K.INTER CO., LTD. (NVK) iBSG v3.5 was discovered to contain a SQL injection vulnerability via the a_passwd…

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