Microsft have released an update for both flavours of Vista citing:
The update is available via Windows Update or the links below:
32Bit:
http://www.microsoft.com/en-us/download/details.aspx?id=44293
64Bit:
http://www.microsoft.com/en-us/download/details.aspx?id=44288
A security issue has been identified that could allow an authenticated remote attacker to compromise your system and gain control over it.
The update is available via Windows Update or the links below:
32Bit:
http://www.microsoft.com/en-us/download/details.aspx?id=44293
64Bit:
http://www.microsoft.com/en-us/download/details.aspx?id=44288