Critical vulnerabilities have been identified in Adobe Reader X (10.0) for Windows and Macintosh; Adobe Reader 9.4.1 and earlier versions for Windows, Macintosh and UNIX; and Adobe Acrobat X (10.0) and earlier versions for Windows and Macintosh.

These vulnerabilities could cause the application to crash and potentially allow an attacker to take control of the affected system. Risk for Adobe Reader X users is significantly lower, as none of these issues bypass Protected Mode mitigations.

Users of Adobe Reader X (10.0) and earlier versions for Windows and Macintosh should update to Adobe Reader X (10.0.1).

Users of Adobe Reader 9.4.1 for UNIX should update to Adobe Reader 9.4.2, expected to be available by the week of February 28, 2011.

Users of Adobe Reader 9.4.1 and earlier versions for Windows and Macintosh who cannot update to Adobe Reader X (10.0.1), can update to Adobe Reader 9.4.2 and Adobe Reader 8.2.6.

Users of Adobe Acrobat X (10.0) for Windows and Macintosh should update to Adobe Acrobat X (10.0.1).

Users of Adobe Acrobat 9.4.1 and earlier versions for Windows and Macintosh should update to Adobe Acrobat 9.4.2, and users of Adobe Acrobat 8.2.5 and earlier versions for Windows and Macintosh should update to Adobe Acrobat 8.2.6.