Quick answers
- Is CVE-2026-41020 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-41020 being exploited in the wild.
- How severe is CVE-2026-41020?
- High severity, with a CVSS score of 7.5, published 27 October 2026.
- Which products and versions are affected?
- Eaton easyE4.
- Is there a fix for CVE-2026-41020?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-41020 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-41020?
- Check whether you run Eaton easyE4. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is an authentication bypass due to static nonce reuse in the easyE4 authentication mechanism. An unauthenticated attacker with network access to captured authentication traffic can replay the nonce and authentication exchange to bypass authentication. The fix requires implementing dynamic, non-repeating nonces in the authentication protocol.
Affected products
- Eaton easyE4
Timeline
- 2026-10-27: disclosed