CVE-2020-27221: Eclipse OPENJ9

Critical severity, CVSS 9.8. EPSS: 1.5% chance of exploitation in the next 30 days.

In Eclipse OpenJ9 up to and including version 0.23, there is potential for a stack-based buffer overflow when the virtual machine or JNI natives are converting from UTF-8 characters to platform encoding.

Affected products

• Eclipse OPENJ9: up to and including 0.23.0

Published 2021-01-21. Last modified 2026-06-17.