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CVE-2021-37386

23
FAUCET Score

CVE-2021-37386 is an HTML injection vulnerability affecting Furukawa Electric LatAm 423-41W/AC (before v1.1.4) and LD421-21W (before v1.3.3) devices, specifically within the serial number update function. With a CVSS score of 7.5 (HIGH), this vulnerability has a network attack vector, low attack complexity, and requires high privileges and user interaction, potentially leading to low confidentiality, low integrity, and high availability impacts. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.2.0CPE matchmatch criteria
cpe:2.3:o:furukawa:423-41w\/ac_firmware:*:*:*:*:*:*:*:*
< 1.5.0CPE matchmatch criteria
cpe:2.3:o:furukawa:ld421-21w_firmware:*:*:*:*:*:*:*:*
< 1.4.0CPE matchmatch criteria
cpe:2.3:o:furukawa:ld420-10r_firmware:*:*:*:*:*:*:*:*
< 1.5.0CPE matchmatch criteria
cpe:2.3:o:furukawa:ld421-21wv_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
HIGH
Exploitability Score
1.7
Impact Score
5.3
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.54%
Probability of exploitation in next 30 days
EPSS Percentile
42.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0054 is in the 53rd percentile among its peer group of 146 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.4 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

cwe.mitre.org / data/definitions/79.html
Not Applicable
gist.githubusercontent.com / LuigiPolidorio/ec78daac7c3d97966f2e3703ca5d1685/raw/d64a487407d6f9685d3907206954a6c84c6fa621/reference.txt
Third Party Advisory
owasp.org / www-project-web-security-testing-guide/latest/4-Web_Application_Security_Testing/11-Client-side_Testing/03-Testing_for_HTML_Injection
Not Applicable
softwall.com.br / cves/publicacao-rce-html-injection-furukawa