check_by_ssh in Nagios nagios-plugins 2.4.5 allows arbitrary command execution via ProxyCommand, LocalCommand, and PermitLocalCommand with \${IFS}. This has been categorized both as fixed in e8810de, and as intended behavior.
- https://github.com/monitoring-plugins/monitoring-plugins/security/advisories/GHSA-p3gv-vmpx-hhw4
- https://github.com/ARPSyndicate/cve-scores