CVE-2021-20648

Arbitrary command execution via undisclosed injection

Published Feb 12, 2021 · Updated Aug 3, 2024

OS command injection in ELECOM WRC-300FEBK-S allows remote authenticated users with administrator rights to execute arbitrary OS commands. ELECOM and JVN have not published the affected management-interface request, parameter, or command-construction operation. Network-adjacent access to the appliance and administrator privileges are required; successful exploitation permits command execution in the router firmware context.

CVSS severity6.8
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in ELECOM WRC-300FEBK-S allows remote authenticated users with administrator rights to execute arbitrary OS commands. ELECOM and JVN have not published the affected management-interface request, parameter, or command-construction operation. Network-adjacent access to the appliance and administrator privileges are required; successful exploitation permits command execution in the router firmware context.

The record

CVE
CVE-2021-20648
Published
Feb 12, 2021
Updated
Aug 3, 2024
Vendor
ELECOM CO., LTD.
Product
WRC-300FEBK-S
Classifications
CWE-78, T1059
Attack vector
adjacent
Privileges
admin

Timeline

How it unfolded

  1. Feb 12, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=WRC-300FEBK-S

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesadmin

What is affected?

ELECOM CO., LTD. · WRC-300FEBK-Sversion=WRC-300FEBK-S

Published CVSS scores

6.8NIST NVDCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.8JPCERT/CC and IPACVSS:3.0/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
7.7NIST NVDAV:A/AC:L/Au:S/C:C/I:C/A:C
5.2JPCERT/CC and IPAAV:A/AC:L/Au:S/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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