high
8
CWE
78 77
Advisory Published
Updated

CVE-2021-20863: OS Command Injection

First published: Wed Dec 01 2021(Updated: )

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.

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-2021-20863?

    CVE-2021-20863 is an OS command injection vulnerability in ELECOM routers.

  • Which ELECOM router firmware versions are affected by CVE-2021-20863?

    ELECOM routers with 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 are affected.

  • How severe is CVE-2021-20863?

    CVE-2021-20863 has a severity rating of high.

  • What is the Common Weakness Enumeration (CWE) ID associated with CVE-2021-20863?

    The CWE IDs associated with CVE-2021-20863 are CWE-77 and CWE-78.

  • How can I fix CVE-2021-20863?

    To fix CVE-2021-20863, update your ELECOM router firmware to a version higher than the vulnerable ones mentioned.

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