CVE-2020-13556: Opener Project Opener

Critical severity, CVSS 9.8. EPSS: 4.7% chance of exploitation in the next 30 days.

An out-of-bounds write vulnerability exists in the Ethernet/IP server functionality of EIP Stack Group OpENer 2.3 and development commit 8c73bf3. A specially crafted series of network requests can lead to remote code execution. An attacker can send a sequence of requests to trigger this vulnerability.

Affected products

Published 2020-12-11. Last modified 2026-06-17.