CVE-2021-37386Network attack vector

Post-reboot service interruption via invalid serial number

Published Jul 17, 2023 · Updated Oct 29, 2024

HTML injection in Furukawa Electric LatAm 423-41W/AC before 1.1.4 and LD421-21W before 1.3.3 allows remote authenticated users to alter web content. The web interface's serial number update function accepts arbitrary HTML tags without neutralizing them, and an invalid serial number disrupts the device after reboot. Exploitation requires high-privileged authentication and user interaction; reported effects are altered interface content and post-reboot service interruption.

CVSS severity7.5
High
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

HTML injection in Furukawa Electric LatAm 423-41W/AC before 1.1.4 and LD421-21W before 1.3.3 allows remote authenticated users to alter web content. The web interface's serial number update function accepts arbitrary HTML tags without neutralizing them, and an invalid serial number disrupts the device after reboot. Exploitation requires high-privileged authentication and user interaction; reported effects are altered interface content and post-reboot service interruption.

The record

CVE
CVE-2021-37386
Published
Jul 17, 2023
Updated
Oct 29, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 29, 2024Record 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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Public exploit references

No public exploit references are available in this record.

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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