CVE-2016-20010
EWWW Image Optimizer before 2.8.5 allows remote command execution because it relies on a protection mechanism involving boolval, which is unavailable before PHP 5.5.
Date published : 2021-05-05
https://plugins.trac.wordpress.org/browser/ewww-image-optimizer/trunk/changelog.txt
Vulnerability in EWWW Image Optimizer plugin. Severity 9.6 (Critical)