Apple released QuickTime version 7.4.5 which addresses 11 vulnerabilities. Vulnerabilities range from denial of service attacks, information leaks to (of course) remote code execution.

Since QuickTime for all operating systems is affected (Mac OS X, Windows XP, Vista), we recommend that you update as soon as possible.

More information about the update is available at http://support.apple.com/kb/HT1241 and files can be downloaded directly from http://www.apple.com/support/quicktime/.

Thanks to Juha-Matti for heads up.

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Bojan