Linear eMerge E3-Series devices allow Command Injections.
packetstormsecurity.com/files/155255/Linear-eMerge-E3-1.00-06-card_scan.php-Command-Injection.html
packetstormsecurity.com/files/155256/Linear-eMerge-E3-1.00-06-card_scan_decoder.php-Command-Injection.html
packetstormsecurity.com/files/155272/Linear-eMerge-E3-Access-Controller-Command-Injection.html
packetstormsecurity.com/files/170372/Linear-eMerge-E3-Series-Access-Controller-Command-Injection.html
applied-risk.com/labs/advisories
www.applied-risk.com/resources/ar-2019-005