CVE-2021-20860

What it is

Cross-site request forgery (CSRF) 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 remote authenticated attacker to hijack the authentication of an administrator via a specially crafted page.

At a glance

Exploitability

Can be exploited over the network without logging in, but needs a user to act. High risk of data exposure, data tampering, service disruption.

Exploit odds

0.6% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2021-12-01 03:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 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: 0.6% 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

0.6% · EPSS, next 30 days

Weakness

CWE-352 · Cross-site request forgery

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

Network

Complexity

Low

Privileges needed

None

User interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

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-2021-20860.md and follow it. Check whether this project is affected by CVE-2021-20860. 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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