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CVE-2021-20863

HIGH
8
CVSS Score
Published: December 1, 2021 at 02:15 AM UTC
Updated: June 17, 2026 at 03:34 AM UTC
28 products affected across 1 vendorWrc 2533GS2 B FirmwareWrc 2533GST2 FirmwareWrc 2533GS2 W Firmware

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Severity
HIGH8
Exploit prediction
EPSS 0.9%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Edwrc 2533GST2 Firmware· Elecom
95%
v ≤ 1.25
elecom-edwrc-2533gst2 (same device)
Wrc 1167GST2 Firmware· Elecom
95%
v ≤ 1.25
Wrc 1167GST2A Firmware· Elecom
95%
v ≤ 1.25
elecom-wrc-1167gst2a (same device)
Wrc 1167GST2H Firmware· Elecom
95%
v ≤ 1.25
elecom-wrc-1167gst2h (same device)
Wrc 1750GS Firmware· Elecom
95%
v ≤ 1.03
elecom-wrc-1750gs (same device)
Wrc 1750GSV Firmware· Elecom
95%
v ≤ 2.11
elecom-wrc-1750gsv (same device)
Wrc 1900GST Firmware· Elecom
95%
v ≤ 1.03
elecom-wrc-1900gst (same device)
Wrc 2533GS2 B Firmware· Elecom
95%
v ≤ 1.52
Wrc 2533GS2 W Firmware· Elecom
95%
v ≤ 1.52
Wrc 2533GST Firmware· Elecom
95%
v ≤ 1.03
elecom-wrc-2533gst (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCThird Party Advisory
Source: [email protected]
https://jvn.jp/en/vu/JVNVU94527926/index.html
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.elecom.co.jp/news/security/20211130-01/

CVSS

8HIGH[email protected]
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-78

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