CVE-2021-37384Network attack vector

Unauthenticated command execution via web interface

Published Jul 17, 2023 · Updated Aug 4, 2024

Command injection in the web interface of Furukawa ONU firmware allows remote attackers to execute arbitrary device commands. The public CVE references do not identify the request parameter, handler, or shell invocation that passes untrusted web input into command execution. No authentication is required; successful exploitation gives command execution on the network appliance, but the undisclosed request details prevent a narrower consequence statement.

CVSS severity9.8
Critical
EPSS probability1.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in the web interface of Furukawa ONU firmware allows remote attackers to execute arbitrary device commands. The public CVE references do not identify the request parameter, handler, or shell invocation that passes untrusted web input into command execution. No authentication is required; successful exploitation gives command execution on the network appliance, but the undisclosed request details prevent a narrower consequence statement.

The record

CVE
CVE-2021-37384
Published
Jul 17, 2023
Updated
Aug 4, 2024
Vendor
Furukawa Electric
Product
LD420-10R Firmware
Classifications
CWE-94, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Furukawa Electric · LD420-10R Firmwareversion=0 <1.4.0
Furukawa Electric · LD421-21W Firmwareversion=0 <1.5.0
Furukawa Electric · G423-41W/AC Firmwareversion=0 <1.2.0
Furukawa Electric · LD421-21WV Firmwareversion=0 <1.5.0

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1190Exploit Public-Facing Application

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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