CVE-2026-41020

Replay Attack via Static Nonce in Eaton easyE4 Authentication

Published Oct 27, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Eaton
Eaton easye4
Vendors & Products Eaton
Eaton easye4
Type Values Removed Values Added
Title Replay Attack via Static Nonce in Eaton easyE4 Authentication
Type Values Removed Values Added
Description 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.
Weaknesses CWE-294
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Eaton
Published
Updated
Nov 4, 2026, 8:29 PM
Reserved
Apr 16, 2026, 5:27 AM
Status
Awaiting Analysis
Published
Oct 27, 2026, 12:17 PM
Modified
Nov 4, 2026, 9:18 PM