CVE-2021-20861

8.8 HIGH 0.5% exploit odds Fix listed

What it is

Improper access control vulnerability in ELECOM LAN 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 attacker to bypass access restriction and to access the management screen of the product via unspecified vectors.

At a glance

Exploitability: Can be exploited from the same network segment without logging in. High risk of data exposure, data tampering, service disruption.
Exploit odds: 0.5% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2021-12-01 03:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:34 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.5% in the next 30 days (EPSS).
Severity: 8.8 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2021-12-01 03:15 UTC
Last modified: 2026-06-17 03:34 UTC
Exploit probability: 0.5% · EPSS, next 30 days
Record status: Modified

Affected

Elecom wrc-1167gst2 Firmware ≤ 1.25
Elecom wrc-1167gst2a Firmware ≤ 1.25
Elecom wrc-1167gst2h Firmware ≤ 1.25
Elecom wrc-2533gs2-b Firmware ≤ 1.52
Elecom wrc-2533gs2-w Firmware ≤ 1.52
Elecom wrc-1750gs Firmware ≤ 1.03
Elecom wrc-1750gsv Firmware ≤ 2.11
Elecom wrc-1900gst Firmware ≤ 1.03

Attack profile CVSS 3.1 · 8.8

Attack vector: Adjacent network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Raw vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-20861.md and follow it. Check whether this project is affected by CVE-2021-20861. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record