CVE-2021-20863

moderate-risk

Published 2021-12-01

OS command injection vulnerability in ELECOM 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 attackers to execute an arbitrary OS command with the root privilege via unspecified vectors.

Do I need to act?

1.2% chance of exploitation in next 30 days

EPSS score — moderate exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 8.0/10 High

ADJACENT_NETWORK / LOW complexity

Affected Products (14)

Wrc-1167Gst2 Firmware

Wrc-1167Gst2A Firmware

Wrc-1167Gst2H Firmware

Wrc-2533Gs2-B Firmware

Wrc-2533Gs2-W Firmware

Wrc-1750Gs Firmware

Wrc-1750Gsv Firmware

Wrc-1900Gst Firmware

Wrc-2533Gst Firmware

Wrc-2533Gst2 Firmware

Wrc-2533Gsta Firmware

Wrc-2533Gst2Sp Firmware

Wrc-2533Gst2-G Firmware

Edwrc-2533Gst2 Firmware

Affected Vendors

Elecom

References (4)

Third Party Advisory https://jvn.jp/en/vu/JVNVU94527926/index.html

Vendor Advisory https://www.elecom.co.jp/news/security/20211130-01/

Third Party Advisory https://jvn.jp/en/vu/JVNVU94527926/index.html

Vendor Advisory https://www.elecom.co.jp/news/security/20211130-01/

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moderate-risk

Severity 25/34 · High

Exploitability 4/34 · Minimal

Exposure 18/34 · Moderate