CVE-2021-20854

MEDIUMNVD 6.86.8—

6.8

ELECOM LAN routers (WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware v1.02.9 and prior) allows a network-adjacent attacker with an administrator privilege to execute arbitrary OS commands via unspecified vectors.

CVSS v3: 6.8
EG Score: 6.8(medium)
EPSS: 57.4%
KEV: Not listed

Published

December 1, 2021

Last Modified

November 21, 2024

References (4)

vultures@jpcerthttps://jvn.jp/en/jp/JVN88993473/index.html
vultures@jpcerthttps://www.elecom.co.jp/news/security/20211130-01/
af854a3a-2127-422b-91ae-364da2661108https://jvn.jp/en/jp/JVN88993473/index.html
af854a3a-2127-422b-91ae-364da2661108https://www.elecom.co.jp/news/security/20211130-01/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-78OS Command Injection

Data Freshness Timeline

(refreshed 14× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

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Frequently asked(5)

What is CVE-2021-20854?

CVE-2021-20854 is a medium vulnerability published on December 1, 2021. ELECOM LAN routers (WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware v1.02.9 and prior) allows a network-adjacent attacker with an administrator privilege to execute arbitrary OS commands via unspecified vectors.

When was CVE-2021-20854 disclosed?

CVE-2021-20854 was first published in the National Vulnerability Database on December 1, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-20854 actively exploited?

CVE-2021-20854 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 57.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-20854?

CVE-2021-20854 has a CVSS v3 base score of 6.8 (NVD).

How do I remediate CVE-2021-20854?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-20854, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-20854

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-20854?

🔗 Related CVEs(same CWE)

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Published

Last Modified

References (4)

Frequently asked(5)

Related CVEs(same CWE)