How severe is CVE-2023-40158?

CVE-2023-40158 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-40158 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-40158?

CVE-2023-40158 primarily affects Cbc Nr4h Firmware. In total, 23 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-40158?

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

When was CVE-2023-40158 published?

CVE-2023-40158 was published on 2023-08-23 and last updated on 2026-06-17.

CVE-2023-40158

CVE-2023-40158 is a high-severity vulnerability in Cbc Nr4h Firmware with a CVSS 3.x base score of 8.8. 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-912.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-912
Affected product: Cbc Nr4h Firmware
Published: 2023-08-23
Last modified: 2026-06-17

Description

Hidden functionality vulnerability in the CBC products allows a remote authenticated attacker to execute an arbitrary OS command on the device or alter its settings. As for the affected products/versions, see the detailed information provided by the vendor. Note that NR4H, NR8H, NR16H series and DR-16F, DR-8F, DR-4F, DR-16H, DR-8H, DR-4H, DR-4M41 series are no longer supported, therefore updates for those products are not provided.

Frequently asked questions

What is CVE-2023-40158?: Hidden functionality vulnerability in the CBC products allows a remote authenticated attacker to execute an arbitrary OS command on the device or alter its settings. As for the affected products/versions, see the detailed information provided by the vendor. Note that NR4H, NR8H, NR16H series and DR-16F, DR-8F, DR-4F, DR-16H, DR-8H, DR-4H, DR-4M41 series are no longer supported, therefore updates for those products are not provided.
How severe is CVE-2023-40158?: CVE-2023-40158 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-40158 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-40158?: CVE-2023-40158 primarily affects Cbc Nr4h Firmware. In total, 23 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-40158?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-40158 published?: CVE-2023-40158 was published on 2023-08-23 and last updated on 2026-06-17.

References

Affected products (23)

cpe:2.3:o:cbc:nr4h_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:nr8h_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:nr16h_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:dr-16f42a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:dr-16f45at_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:dr-8f42a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:dr-8f45at_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:dr-4fx1_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:dr-16h_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:dr-8h_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:dr-4h_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:drh8-4m41-a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:nr8-4m71_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:nr8-8m72_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:nr-16m_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:nr-16f85-8pra_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:nr-16f82-16p_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:nr-4f_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:nr-8f_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:dr-16m52_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:dr-16m52-av_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:dr-8m52-av_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:cbc:dr-4m51-av_firmware:-:*:*:*:*:*:*:*

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