TI-2021-03965 Aliases CVE-2021-20739 GHSA-6g7g-h77w-72mh

OS command injection in ELECOM CO.,LTD. WRC-300FEBK, WRC-F300NF, WRC-733FEBK, WRH-300RD…

LOW 39CWE-78Published 2021-07-07 · Updated 2024-08-03

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-78.

Summary

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.

Why it matters now

EPSS 0.00512 43rd percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
ELECOM CO.,LTD.	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	—	No fix listed	CNA

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 VendorELECOM CO.,LTD. Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 22

CPE	Versions	Role	Vendor
cpe:2.3:o:elecom:wrc-300febk_firmware::::::::	all versions	Vulnerable	ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrc-300febk:-:::::::*	not specified by NVD	Running on	ELECOM CO.,LTD.
cpe:2.3:o:elecom:wrc-f300nf_firmware::::::::	all versions	Vulnerable	ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrc-f300nf:-:::::::*	not specified by NVD	Running on	ELECOM CO.,LTD.
cpe:2.3:o:elecom:wrc-733febk_firmware::::::::	all versions	Vulnerable	ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrc-733febk:-:::::::*	not specified by NVD	Running on	ELECOM CO.,LTD.
cpe:2.3:o:elecom:wrh-300rd_firmware::::::::	all versions	Vulnerable	ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrh-300rd:-:::::::*	not specified by NVD	Running on	ELECOM CO.,LTD.
cpe:2.3:o:elecom:wrh-300bk_firmware::::::::	all versions	Vulnerable	ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrh-300bk:-:::::::*	not specified by NVD	Running on	ELECOM CO.,LTD.

cpe:2.3:o:elecom:wrc-300febk_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrc-300febk:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
cpe:2.3:o:elecom:wrc-f300nf_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrc-f300nf:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
cpe:2.3:o:elecom:wrc-733febk_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrc-733febk:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
cpe:2.3:o:elecom:wrh-300rd_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrh-300rd:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
cpe:2.3:o:elecom:wrh-300bk_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrh-300bk:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.

Show 12 more CPE

CPE	Versions	Role	Vendor
cpe:2.3:o:elecom:wrh-300sv_firmware::::::::	all versions	Vulnerable	ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrh-300sv:-:::::::*	not specified by NVD	Running on	ELECOM CO.,LTD.
cpe:2.3:o:elecom:wrh-300wh_firmware::::::::	all versions	Vulnerable	ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrh-300wh:-:::::::*	not specified by NVD	Running on	ELECOM CO.,LTD.
cpe:2.3:o:elecom:wrh-h300wh_firmware::::::::	all versions	Vulnerable	ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrh-h300wh:-:::::::*	not specified by NVD	Running on	ELECOM CO.,LTD.
cpe:2.3:o:elecom:wrh-h300bk_firmware::::::::	all versions	Vulnerable	ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrh-h300bk:-:::::::*	not specified by NVD	Running on	ELECOM CO.,LTD.
cpe:2.3:o:elecom:wrh-300bk-s_firmware::::::::	all versions	Vulnerable	ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrh-300bk-s:-:::::::*	not specified by NVD	Running on	ELECOM CO.,LTD.
cpe:2.3:o:elecom:wrh-300wh-s_firmware::::::::	all versions	Vulnerable	ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrh-300wh-s:-:::::::*	not specified by NVD	Running on	ELECOM CO.,LTD.

cpe:2.3:o:elecom:wrh-300sv_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrh-300sv:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
cpe:2.3:o:elecom:wrh-300wh_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrh-300wh:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
cpe:2.3:o:elecom:wrh-h300wh_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrh-h300wh:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
cpe:2.3:o:elecom:wrh-h300bk_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrh-h300bk:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
cpe:2.3:o:elecom:wrh-300bk-s_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrh-300bk-s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.
cpe:2.3:o:elecom:wrh-300wh-s_firmware:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·ELECOM CO.,LTD.
cpe:2.3:h:elecom:wrh-300wh-s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ELECOM CO.,LTD.

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-20739
2026-10-03 Alias added: GHSA-6g7g-h77w-72mh

References

Advisory 2

TI-2023-23457 Inadequate encryption strength vulnerability in multiple routers provided by ELECOM… CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences