Symantec warned its enterprise customers Thursday that an unpatched vulnerability in Windows 2000's file sharing protocol has surfaced, with details of an exploit expected to show next month...the exploit leverages a flaw in the operating system's kernel that can be triggered through SMB, and will give an attacker full access to the PC...An official security update from Microsoft will likely not be in development until after June when the information is released

Update 19:40UTC : It was all a series of unfortunate events. FrSIRT has pulled their incorrect advisory related to the upcoming release of an exploit for MS05-011 in the next ImmunityInc CANVAS release.