high
8.8
Advisory Published
Updated

CVE-2021-20864

First published: Wed Dec 01 2021(Updated: )

Improper access control 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 unauthenticated attacker to bypass access restriction, and to start the telnet service and execute an arbitrary OS command via unspecified vectors.

Credit: vultures@jpcert.or.jp

Affected SoftwareAffected VersionHow to fix
Elecom Wrc-1167gst2 Firmware<=1.25
Elecom Wrc-1167gst2 Firmware
Elecom Wrc-1167gst2a Firmware<=1.25
Elecom Wrc-1167gst2a Firmware
Elecom WRC-1167GST2H Firmware<=1.25
Elecom Wrc-1167gst2h Firmware
Elecom Wrc-2533gs2-b Firmware<=1.52
Elecom Wrc-2533gs2-b Firmware
Elecom WRC-2533GS2-W<=1.52
Elecom WRC-2533GS2-W
Elecom Wrc-1750gs Firmware<=1.03
Elecom Wrc-1750gs Firmware
Elecom Wrc-1750gsv<=2.11
Elecom WRC-1750GSV
Elecom Wrc-1900gst Firmware<=1.03
Elecom Wrc-1900gst Firmware
Elecom WRC-2533GST Firmware<=1.03
Elecom Wrc-2533gst Firmware
Elecom Wrc-2533gst2-g Firmware<=1.25
Elecom Wrc-2533gst2-g
Elecom Wrc-2533gsta Firmware<=1.03
Elecom Wrc-2533gsta Firmware
Elecom Wrc-2533gst2sp Firmware<=1.25
Elecom Wrc-2533gst2sp Firmware
Elecom Edwrc-2533gst2<=1.25
Elecom WRC-2533GST2-G Firmware
Elecom Edwrc-2533gst2<=1.25
Elecom Edwrc-2533gst2 Firmware

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Reference Links

Frequently Asked Questions

  • What is the vulnerability ID of this ELECOM router vulnerability?

    The vulnerability ID is CVE-2021-20864.

  • What is the severity of CVE-2021-20864?

    The severity of CVE-2021-20864 is high with a severity value of 8.8.

  • Which ELECOM router models are affected by CVE-2021-20864?

    ELECOM routers WRC-1167GST2, WRC-1167GST2A, WRC-1167GST2H, WRC-2533GS2-B, WRC-2533GS2-W, and WRC-1750GS with specific firmware versions are affected.

  • How can I fix CVE-2021-20864?

    To fix CVE-2021-20864, it is recommended to update the firmware of the affected ELECOM routers to versions above 1.25 for WRC-1167GST2 models and above 1.52 for WRC-2533GS2-B and WRC-2533GS2-W models.

  • Where can I find more information about CVE-2021-20864?

    You can find more information about CVE-2021-20864 on the JVN website and the official ELECOM security advisory.

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