How severe is CVE-2021-37386?

CVE-2021-37386 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability high.

Is CVE-2021-37386 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-37386?

CVE-2021-37386 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-2021-37386?

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-2021-37386 published?

CVE-2021-37386 was published on 2023-07-17 and last updated on 2026-06-17.

CVE-2021-37386

CVE-2021-37386 is a high-severity vulnerability in Furukawa 423-41w/ac Firmware with a CVSS 3.x base score of 7.5. 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-79.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Furukawa 423-41w/ac Firmware
Published: 2023-07-17
Last modified: 2026-06-17

Description

Furukawa Electric LatAm 423-41W/AC before v1.1.4 and LD421-21W before v1.3.3 were discovered to contain an HTML injection vulnerability via the serial number update function.

Frequently asked questions

What is CVE-2021-37386?: Furukawa Electric LatAm 423-41W/AC before v1.1.4 and LD421-21W before v1.3.3 were discovered to contain an HTML injection vulnerability via the serial number update function.
How severe is CVE-2021-37386?: CVE-2021-37386 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability high.
Is CVE-2021-37386 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-37386?: CVE-2021-37386 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-2021-37386?: 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-2021-37386 published?: CVE-2021-37386 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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