medium
4.3
CWE
352
Advisory Published
Updated

CVE-2021-20862: CSRF

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 obtain anti-CSRF tokens and change the product's settings via unspecified vectors.

Credit: vultures@jpcert.or.jp

Affected SoftwareAffected VersionHow to fix
Elecom Wrc-1167gst2 Firmware<=1.25
Elecom Wrc-1167gst2
Elecom Wrc-1167gst2a Firmware<=1.25
Elecom Wrc-1167gst2a
Elecom Wrc-1167gst2h Firmware<=1.25
Elecom Wrc-1167gst2h
Elecom Wrc-2533gs2-b Firmware<=1.52
Elecom Wrc-2533gs2-b
Elecom Wrc-2533gs2-w Firmware<=1.52
Elecom Wrc-2533gs2-w
Elecom Wrc-1750gs Firmware<=1.03
Elecom Wrc-1750gs
Elecom Wrc-1750gsv Firmware<=2.11
Elecom Wrc-1750gsv
Elecom Wrc-1900gst Firmware<=1.03
Elecom Wrc-1900gst
Elecom Wrc-2533gst Firmware<=1.03
Elecom Wrc-2533gst
Elecom Wrc-2533gst2 Firmware<=1.25
Elecom Wrc-2533gst2
Elecom Wrc-2533gsta Firmware<=1.03
Elecom Wrc-2533gsta
Elecom Wrc-2533gst2sp Firmware<=1.25
Elecom Wrc-2533gst2sp
Elecom Wrc-2533gst2-g Firmware<=1.25
Elecom Wrc-2533gst2-g
Elecom Edwrc-2533gst2 Firmware<=1.25
Elecom Edwrc-2533gst2

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Reference Links

Frequently Asked Questions

  • What is CVE-2021-20862?

    CVE-2021-20862 is an improper access control vulnerability in ELECOM routers.

  • Which ELECOM router models are affected by CVE-2021-20862?

    The ELECOM router models affected by CVE-2021-20862 include WRC-1167GST2, WRC-1167GST2A, WRC-1167GST2H, WRC-2533GS2-B, WRC-2533GS2-W, and WRC-1750GS.

  • What is the severity of CVE-2021-20862?

    CVE-2021-20862 has a severity rating of 4.3 (medium).

  • How can I fix CVE-2021-20862?

    To fix CVE-2021-20862, you should update the firmware of your ELECOM router to version 1.25 (or later) for affected models.

  • Where can I find more information about CVE-2021-20862?

    You can find more information about CVE-2021-20862 on the JVN and ELECOM websites.

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