What’s Vulnerable › Vulnerabilities

CVE-2021-37386

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-07-17 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• Furukawa 423-41W/Ac Firmware: before 1.2.0 — fixed in 1.2.0
• Furukawa Ld420-10R Firmware: before 1.4.0 — fixed in 1.4.0
• Furukawa Ld421-21W Firmware: before 1.5.0 — fixed in 1.5.0
• Furukawa Ld421-21Wv Firmware: before 1.5.0 — fixed in 1.5.0

How to fix

Upgrade to a fixed version: Furukawa 423-41W/Ac Firmware 1.2.0; Furukawa Ld420-10R Firmware 1.4.0; Furukawa Ld421-21W Firmware 1.5.0; Furukawa Ld421-21Wv Firmware 1.5.0. Check the vendor advisory for mitigations.

References

• https://cwe.mitre.org/data/definitions/79.html
• https://gist.githubusercontent.com/LuigiPolidorio/ec78daac7c3d97966f2e3703ca5d1685/raw/d64a487407d6f9685d3907206954a6c84c6fa621/reference.txt
• https://owasp.org/www-project-web-security-testing-guide/latest/4-Web_Application_Security_Testing/11-Client-side_Testing/03-Testing_for_HTML_Injection
• https://www.softwall.com.br/cves/publicacao-rce-html-injection-furukawa/
• https://cwe.mitre.org/data/definitions/79.html
• https://gist.githubusercontent.com/LuigiPolidorio/ec78daac7c3d97966f2e3703ca5d1685/raw/d64a487407d6f9685d3907206954a6c84c6fa621/reference.txt
• https://owasp.org/www-project-web-security-testing-guide/latest/4-Web_Application_Security_Testing/11-Client-side_Testing/03-Testing_for_HTML_Injection
• https://www.softwall.com.br/cves/publicacao-rce-html-injection-furukawa/

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