Microsoft » Windows Xp : Security Vulnerabilities, CVEs, CVSS score between 8 and 8.99

The Forms Authentication feature in the ASP.NET subsystem in Microsoft .NET Framework 1.1 SP1, 2.0 SP2, 3.5 SP1, 3.5.1, and 4.0 allows remote authenticated users to obtain access to arbitrary user accounts via a crafted username, aka "ASP.Net Forms Authentication Bypass Vulnerability."

Microsoft Windows Media Format Runtime 9.0, 9.5, and 11; and Microsoft Media Foundation on Windows Vista Gold, SP1, and SP2 and Server 2008; allows remote attackers to execute arbitrary code via an MP3 file with crafted metadata that triggers memory corruption, aka "Windows Media Playback Memory Corruption Vulnerability."

Integer overflow in Avifil32.dll in the Windows Media file handling functionality in Microsoft Windows allows remote attackers to execute arbitrary code on a Windows 2000 SP4 system via a crafted AVI file, or cause a denial of service on a Windows XP SP2 or SP3, Server 2003 SP2, Vista Gold, SP1, or SP2, or Server 2008 Gold or SP2 system via a crafted AVI file, aka "AVI Integer Overflow Vulnerability."

The Bluetooth stack in Microsoft Windows XP SP2 and SP3, and Vista Gold and SP1, allows physically proximate attackers to execute arbitrary code via a large series of Service Discovery Protocol (SDP) packets.

The DNS client in Microsoft Windows 2000 SP4, XP SP2, Server 2003 SP1 and SP2, and Vista uses predictable DNS transaction IDs, which allows remote attackers to spoof DNS responses.