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Vulnerability record · CVE-2021-20859 · published 1 December 2021

CVE-2021-20859: Elecom wrc-1167gst2 firmware os command injection vulnerability

Elecom · Wrc 1167gst2 Firmware

ELECOM LAN routers (WRC-1167GST2 firmware v1.25 and prior, WRC-1167GST2A firmware v1.25 and prior, WRC-1167GST2H firmware v1.25 and prior, WRC-2533GS2-B firmware v1.52 and prior, WRC-2533GS2-W firmware v1.52 and prior, WRC-1750GS firmware v1.03 and prior, WRC-1750GSV firmware v2.11 and prior, WRC-1900GST firmware v1.03 and prior, WRC-2533GST firmware v1.03 and prior, WRC-2533GSTA firmware v1.03 and prior, WRC-2533GST2 firmware v1.25 and prior, WRC-2533GST2SP firmware v1.25 and prior, WRC-2533GST2-G firmware v1.25 and prior, and EDWRC-2533GST2 firmware v1.25 and prior) allows a network-adjacent authenticated attacker to execute an arbitrary OS command via unspecified vectors.

8.0 CVSS 3.1 High EPSS 0.56% · top 55.4% CWE-78 · OS command injection
8.0CVSS 3.1 base score, v2 7.7
0.56%EPSS exploitation probability, 30 days
NoNot in CISA KEV
14Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

ELECOM LAN routers (WRC-1167GST2 firmware v1.25 and prior, WRC-1167GST2A firmware v1.25 and prior, WRC-1167GST2H firmware v1.25 and prior, WRC-2533GS2-B firmware v1.52 and prior, WRC-2533GS2-W firmware v1.52 and prior, WRC-1750GS firmware v1.03 and prior, WRC-1750GSV firmware v2.11 and prior, WRC-1900GST firmware v1.03 and prior, WRC-2533GST firmware v1.03 and prior, WRC-2533GSTA firmware v1.03 and prior, WRC-2533GST2 firmware v1.25 and prior, WRC-2533GST2SP firmware v1.25 and prior, WRC-2533GST2-G firmware v1.25 and prior, and EDWRC-2533GST2 firmware v1.25 and prior) allows a network-adjacent authenticated attacker to execute an arbitrary OS command via unspecified vectors.

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

Affected products

14 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://jvn.jp/en/jp/JVN88993473/index.html Third Party Advisory
https://www.elecom.co.jp/news/security/20211130-01/ Vendor Advisory
https://jvn.jp/en/jp/JVN88993473/index.html Third Party Advisory
https://www.elecom.co.jp/news/security/20211130-01/ Vendor Advisory

Track CVE-2021-20859 inside VULONE

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2024-23910Elecom wrc-1167gs2-b firmware cross-site request forgery vulnerabilityCross-site request forgery (CSRF) vulnerability in ELECOM wireless LAN routers and wireless LAN repeater allows a remote unauthenticated attacker to …EPSS 0.25%8.8CVE-2022-25915Elecom wrc-1167gst2 firmware vulnerabilityImproper access control vulnerability in ELECOM LAN routers (WRC-1167GST2 firmware v1.25 and prior, WRC-1167GST2A firmware v1.25 and prior, WRC-1167G…EPSS 0.45%8.8CVE-2021-20860Elecom wrc-1167gst2 firmware cross-site request forgery vulnerabilityCross-site request forgery (CSRF) vulnerability in ELECOM LAN routers (WRC-1167GST2 firmware v1.25 and prior, WRC-1167GST2A firmware v1.25 and prior,…EPSS 0.55%8.8CVE-2021-20861Elecom wrc-1167gst2 firmware vulnerabilityImproper access control vulnerability in ELECOM LAN routers (WRC-1167GST2 firmware v1.25 and prior, WRC-1167GST2A firmware v1.25 and prior, WRC-1167G…EPSS 0.46%8.8CVE-2021-20864Elecom wrc-1167gst2 firmware vulnerabilityImproper access control vulnerability in ELECOM routers (WRC-1167GST2 firmware v1.25 and prior, WRC-1167GST2A firmware v1.25 and prior, WRC-1167GST2H…EPSS 0.52%8.8CVE-2020-5634Elecom wrc-2533gst2 firmware vulnerabilityELECOM LAN routers (WRC-2533GST2 firmware versions prior to v1.14, WRC-1900GST2 firmware versions prior to v1.14, WRC-1750GST2 firmware versions prio…EPSS 0.61%8.0CVE-2021-20863Elecom wrc-1167gst2 firmware os command injection vulnerabilityOS command injection vulnerability in ELECOM routers (WRC-1167GST2 firmware v1.25 and prior, WRC-1167GST2A firmware v1.25 and prior, WRC-1167GST2H fi…EPSS 0.86%4.8CVE-2024-21798Elecom wrc-1167gs2-b firmware cross-site scripting vulnerabilityELECOM wireless LAN routers contain a cross-site scripting vulnerability. Assume that a malicious administrative user configures the affected product…EPSS 1.3%

Source: NIST National Vulnerability Database (record CVE-2021-20859), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.