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CVE-2021-20719

21
FAUCET Score

CVE-2021-20719 is a critical vulnerability affecting Nippon Antenna RFNTPS firmware versions System_01000004 and earlier, and Web_01000004 and earlier. This flaw allows an attacker on the same network segment to execute arbitrary OS commands with root privileges through unspecified vectors. With a CVSS score of 6.8 (Medium), it poses a significant risk due to its low attack complexity and high impact on confidentiality, integrity, and availability. There is currently no public exploit code available (Metasploit, Nuclei, ExploitDB), nor is it listed in CISA's KEV catalog. Community discussion and media coverage are minimal, indicating low public awareness.

Impacted Technologies

VendorProductVersion(s)CPE
<= system_01000004CPE matchmatch criteria
cpe:2.3:o:nippon-antenna:rfntps_firmware:*:*:*:*:*:*:*:*
<= web_01000004CPE matchmatch criteria
cpe:2.3:o:nippon-antenna:rfntps_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.8MEDIUM

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

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
0.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.44%
Probability of exploitation in next 30 days
EPSS Percentile
36.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0044 is in the 25th percentile among its peer group of 399 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

jvn.jp / en/jp/JVN13076220/index.html
Third Party Advisory
nippon-antenna.co.jp / ja/news/news/news8217702780390204428.html
Vendor Advisory