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CVE-2021-37384

27
FAUCET Score

CVE-2021-37384 is a critical Remote Code Execution (RCE) vulnerability affecting several Furukawa ONU models, including the 423_41W/AC and LD421_21W series. This flaw allows unauthenticated remote attackers to execute arbitrary commands on affected devices through the web interface. With a CVSS score of 9.8, it presents a severe risk due to its network-based attack vector, low attack complexity, and complete compromise of confidentiality, integrity, and availability. Despite its critical severity, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

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

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.66%
Probability of exploitation in next 30 days
EPSS Percentile
74.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0166 is in the 62nd percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 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/94.html
Not Applicable
gist.githubusercontent.com / LuigiPolidorio/9fe61cf2edee63152161ffc52c39f6cd/raw/529cf49103e0fdf4eeb970fa1f62fa508ebe7c3c/reference.txt
Third Party Advisory
owasp.org / www-community/attacks/Code_Injection
Not Applicable
softwall.com.br / cves/publicacao-rce-html-injection-furukawa