If you haven't applied MS06-025 then you should get it on as soon as possible, as there has been some proof of concept code produced to take advantage of the vulnerability this patches.

Microsoft Security Advisory has the details.
"Mitigating Factors:
• Customers who have installed the MS06-025 security update are not affected by this vulnerability.

• Windows 2000 systems are primarily at risk from this vulnerability. Customers running Windows 2000 should deploy MS06-025 as soon as possible or disable the RASMAN service.

• On Windows XP Service Pack 2, Windows Server 2003 and Windows Server 2003 Service Pack 1 the attacker would need to have valid logon credentials in order to exploit the vulnerability."