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TI-2026-81119 Aliases CVE-2026-41020GHSA-4r7w-hmfv-2648

Static nonce in Eaton easyE4 authentication enables replay attacks

Priority LOW 34CWE-294Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-294.

Summary

Eaton easyE4 versions before 2.46 use a static nonce during authentication. This flaw, classified as CWE-294 (authentication bypass by capture-replay), lets an unauthenticated remote attacker who has captured authentication traffic replay a valid authentication exchange. A successful replay gives the attacker unauthorized access to the device.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00226 13th percentileScored 2026-11-07
Fix Fixed easyE4 (Eaton): 2.46

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
EatoneasyE4before 2.462.46Patch availableCNA
  • easyE4 VendorEaton Affected before 2.46 Fixed in 2.46 Patch available CNA

Remediation

Eaton easyE4 version 2.46 fixes this flaw. Upgrade to version 2.46.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

  • Fix · CNA easyE4 (Eaton) Fixed in 2.46

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Eaton easyE4 — eaton.com/content/dam/eaton/company/news-insights/cybersecu…

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-81125 Weak password policy in Eaton easyE4 allows offline password guessingPriority LOW 34
    Show all 2 records → Advisory →

Timeline

  1. 2026-10-27 Threatist record created from CVE-2026-41020
  2. 2026-10-27 Alias added: GHSA-4r7w-hmfv-2648
  3. 2026-10-28 Priority changed: MEDIUM → LOW
  4. 2026-11-04 CISA SSVC decision points changed

References

Advisory 1

  • TI-2018-11555 Eaton Power Xpert Meter 4000, 6000, and 8000 devices before 13.4.0.10 have a single SSH… CVSS 3.0CRITICAL 9.8
  • TI-2021-06017 Arbitrary File delete CVSS 3.1CRITICAL 10.0
  • TI-2018-08624 Local file inclusion in Eaton Intelligent Power Manager v1.6 allows an attacker to… CVSS 3.0CRITICAL 9.8
  • TI-2018-06389 Stack-based buffer overflow in ICS-CERT Eaton 9000X Drive CVSS 3.1CRITICAL 9.8
  • TI-2008-06504 Eaton MGEOPS Network Shutdown Module before 3.10 Build 13 allows remote attackers to… CVSS 2.0HIGH 10.0
  • TI-2021-06019 Remote code execution in Eaton Intelligent Power manager CVSS 3.1CRITICAL 10.0
See all 74 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences