---
id: CVE-2026-41020
title: >-
  Eaton easyE4 uses a static nonce during authentication, which could allow an
  unauthenticated attacker with access to captured authentication traffic to
  replay a valid authentication exchange and gain unauthorized access to the
  device.
summary: >-
  Eaton easyE4 uses a static nonce during authentication, which could allow an
  unauthenticated attacker with access to captured authentication traffic to
  replay a valid authentication exchange and gain unauthorized access to the
  device.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-294
vendor: Eaton
product: easyE4
affected:
  - easyE4 < 2.46
published: '2026-10-27'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T11:05:51.545Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-41020'
references:
  - url: >-
      https://www.eaton.com/content/dam/eaton/company/news-insights/cybersecurity/security-bulletins/eaton-va-2026-1017.pdf
tags:
  - cve.org
ingestedAt: '2026-10-27T16:11:59.301Z'
---

## Overview

Eaton easyE4 uses a static nonce during authentication, which could allow an unauthenticated attacker with access to captured authentication traffic to replay a valid authentication exchange and gain unauthorized access to the device.

## Affected

- `easyE4 < 2.46`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.