CVE-2021-20739

Name: CVE-2021-20739
Creator: NVD / NIST
Published: 2021-07-07T08:15:07.813+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.51%

Last modified Jun 17, 2026

CVE-2021-20739 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. WRC-300FEBK, WRC-F300NF, WRC-733FEBK, WRH-300RD, WRH-300BK, WRH-300SV, WRH-300WH, WRH-H300WH, WRH-H300BK, WRH-300BK-S, and WRH-300WH-S all versions allows an unauthenticated network-adjacent attacker to execute an arbitrary OS command via unspecified vectors.. EPSS estimates a 0.51% chance of exploitation in the next 30 days.

Description

WRC-300FEBK, WRC-F300NF, WRC-733FEBK, WRH-300RD, WRH-300BK, WRH-300SV, WRH-300WH, WRH-H300WH, WRH-H300BK, WRH-300BK-S, and WRH-300WH-S all versions allows an unauthenticated network-adjacent attacker to execute an arbitrary OS command via unspecified vectors.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.51%

39.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Elecom	Wrc-300febk Firmware	All versions
Elecom	Wrc-F300nf Firmware	All versions
Elecom	Wrc-733febk Firmware	All versions
Elecom	Wrh-300rd Firmware	All versions
Elecom	Wrh-300bk Firmware	All versions
Elecom	Wrh-300sv Firmware	All versions
Elecom	Wrh-300wh Firmware	All versions
Elecom	Wrh-H300wh Firmware	All versions
Elecom	Wrh-H300bk Firmware	All versions
Elecom	Wrh-300bk-S Firmware	All versions
Elecom	Wrh-300wh-S Firmware	All versions

References

https://jvn.jp/en/vu/JVNVU94260088/index.htmlThird Party Advisory
https://www.elecom.co.jp/news/security/20210706-01/Vendor Advisory
https://jvn.jp/en/vu/JVNVU94260088/index.htmlThird Party Advisory
https://www.elecom.co.jp/news/security/20210706-01/Vendor Advisory

Timeline

Published: Jul 7, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20739?

How severe is CVE-2021-20739?

CVE-2021-20739 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.51% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20739?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20739?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST