Apple has shipped QuickTime 7.6.7 to fix a critical vulnerability that exposes Windows users to malicious hacker attacks. The update is available for Windows XP SP3 and later, Windows Vista and Windows 7. A stack buffer overflow exists in QuickTime s error logging. Viewing a maliciously crafted movie file may lead to an unexpected application termination or arbitrary code execution. This issue is addressed by disabling debug logging. This issue does not affect Mac OS X systems. The update may be obtained from the Windows software update application or from the QuickTime Downloads site.
Source: https://threatpost.com/apple-warns-critical-quicktime-windows-flaw-081310/74328/