CVE-2021-27478: Opener Project Opener

High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days.

A specifically crafted packet sent by an attacker to EIPStackGroup OpENer EtherNet/IP commits and versions prior to Feb 10, 2021 may cause a denial-of-service condition.

Affected products

• Opener Project Opener: up to and including 2.3

Published 2022-05-12. Last modified 2026-06-17.