Disturbing reports in recent years of hackers hijacking baby monitors and screaming at children have creeped out parents, but these incidents apparently haven’t spooked makers of these devices.

A security analysis of nine baby monitors from different manufacturers revealed serious vulnerabilities and design flaws that could allow hackers to hijack their video feeds or take full control of the devices.

The tests were performed by researchers from security firm Rapid7 during the first half of this year and the results were released Tuesday in a white paper. On a scale from A to F that rated their security functionality and implementation, eight of the devices received an F and one a D.

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