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Seoul-based electronics company Samsung may have compromised the personal data of millions of device owners after it allowed the domain name of one of its apps to expire. The app, S Suggest, came pre-installed on older Samsung tablets and smartphones. After its discontinuation in 2014, Samsung failed to renew ssuggest.com, one of the websites used to control the application. By allowing it to expire, the multimedia conglomerate allegedly opened the door for cybercriminals to spread malware-laden apps onto mobile devices.S Suggest, which recommends popular Android-based apps to users, is still active on millions of older Samsung devices. More than 620 million "check-ins" from at least 2.1 million devices were tracked during a 24-hour period.Ssuggest.com was recently purchased by João Gouveia, the chief technology officer of Lisbon-based threat intelligence firm Anubis Networks. Still, he warns that older Samsung devices may be infected with malware, adware or Trojan viruses if hackers infiltrated the site. They may have even gained the ability to control smartphones and tablets using malicious software.S Suggest also requires a number of user permissions that would have allowed hackers to install unwanted apps, track user activity and restart devices. This means that if someone with criminal intent gained access to the site, device owners may be at risk. Gouveia said he'd return ssuggest.com to Samsung, which denied any wrongdoing. The electronics company told Motherboard on Wednesday that access to the expired domain "does not allow you to install malicious apps, it does not allow you to take control of users' phones."Samsung mobile device users should update their operating systems and install security apps to safeguard against unwanted infections or malware.