If you have an Apple gadget then it's time for an update.

       Millions of Apple users have been urged to update their devices following disclosed serious vulnerabilities for iPhones and iPads.

       The firm has released emergency security updates sharing that it has been hit by targeted and "extremely sophisticated" attacks.

       The hacks could possibily allow attackers to completely take over devices that haven't downloaded the latest secruity patch.

       The devices at risk are iPhone XS and later, ipad Pro 13-inch, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 7th generation and later, iPad mini 5th generation and later.

       READ MORE: Keep your iPhone extra safe using little-known Apple feature

       "A physical attack may disable USB Restricted Mode on a locked device," Apple revealed in a warning to iPhone and iPad users.

       "Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals."

       The tech giant's explanation of the vulnerability means a hacker could get "full admin access" to the device, which would permit intruders to impersonate the device's owner and subsequently run any software in their name.

       In order to ensure that hackers do not use any of the faults mentioned in this update against your device, it is advised to update your iPhones and iPads to the latest version of iOS as soon as possible.

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       There have been no confirmined reports of specific caes where the secruity flaw has been used against people or devices, and Apple has made no statement on the issue further to an update on its website, reports Daily Mail.

       The USB Restricted Mode is a security features inroduced in iOS 11.4.1 nearly seven years ago. It is meant to make apple devices inaccessible to third-party software after the sceen has been locked for one hour.

       This means that law enforcement, hackers, or any one else who plans to copy the contents of your phone to a computer, flash driver or similar device are not able to.

       It was launched following mobile device forensics company, Grayshit developped GrayKey - a technology designed to unlock any iPhone by connecting the mobile device to the box via a USB cable.

       After that between two hours and three days, the phone will display a black screen showing the device's passcode and other information, according to Malwarebytes.

       GrayKey has previously recieved criticism from privacy advocates and cyper security experts, who have warned that the technology could end up in the hands of thieves if it ends up on the black market.

       The company is run by US intelligence agency contractors and an ex-Apple security engineer.