Apple has issued two software updates, including the first security fix for Apple TV and an unprecedented tenth update for Mac OS 10.4. 

The downloads are available through the Software Update component installed on both products, or through the Apple Security Updates website. 

The Apple TV 1.1 update includes the software needed to run YouTube on the Apple TV, as well as the first 'critical' security update for the set-top box. 

A vulnerability in the UPnP IGD networking component could allow a remote attacker to crash the device and possibly execute code.

Apple also released an update for Mac OS X 10.4, making 'Tiger' the first version of the operating system software to reach the '.10' update milestone in the 23-year history of the Macintosh computer.

The 10.4.10 update contains a fix for a vulnerability in the IPv6 networking software. If exploited, an attacker could take over a portion of the networking bandwidth and cause a slowdown in performance on a user's system.

The update also fixes compatibility issues with several external devices, including USB hard drives and Bluetooth headsets. Bugs in several system components, including the calendar and calculator software, were also patched.