Advantech EKI-1524, EKI-1522, EKI-1521 devices through 1.21 are affected by an command injection vulnerability in the NTP server input field, which can be triggered by authenticated users via a crafted POST request.
https://www.advantech.com/en/support/details/firmware?id=1-1J9BED3
https://www.advantech.com/en/support/details/firmware?id=1-1J9BECT
https://www.advantech.com/en/support/details/firmware?id=1-1J9BEBL
https://cyberdanube.com/en/multiple-vulnerabilities-in-advantech-eki-15xx-series/