How severe is CVE-2021-37384?

CVE-2021-37384 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-2021-37384 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-37384?

CVE-2021-37384 primarily affects Furukawa 423-41w/ac Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-37384?

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-2021-37384 published?

CVE-2021-37384 was published on 2023-07-17 and last updated on 2026-06-17.

CVE-2021-37384

CVE-2021-37384 is a critical-severity vulnerability in Furukawa 423-41w/ac Firmware 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-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Furukawa 423-41w/ac Firmware
Published: 2023-07-17
Last modified: 2026-06-17

Description

RCE (Remote Code Execution) vulnerability was found in some Furukawa ONU models, this vulnerability allows remote unauthenticated users to send arbitrary commands to the device via web interface.

Frequently asked questions

What is CVE-2021-37384?: RCE (Remote Code Execution) vulnerability was found in some Furukawa ONU models, this vulnerability allows remote unauthenticated users to send arbitrary commands to the device via web interface.
How severe is CVE-2021-37384?: CVE-2021-37384 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-2021-37384 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-37384?: CVE-2021-37384 primarily affects Furukawa 423-41w/ac Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-37384?: 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-2021-37384 published?: CVE-2021-37384 was published on 2023-07-17 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:o:furukawa:423-41w\/ac_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:furukawa:ld421-21w_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:furukawa:ld420-10r_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:furukawa:ld421-21wv_firmware:*:*:*:*:*:*:*:*

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