QUOTE
Microsoft is releasing the following security bulletins for newly discovered vulnerabilities:
Bulletin Number
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MS07-018 (Critical) Content Management Server 2001 and 2002 [Remote Code Execution]
MS07-019 (Critical) Windows XP [Remote Code Execution]
MS07-020 (Critical) Windows 2000, Windows XP, Windows Server 2003 [Remote Code Execution]
MS07-021 (Critical) All current versions of Microsoft Windows [Remote Code Execution]
MS07-022 (Important)Windows 2000, Windows XP, Windows Server 2003 [Elevation of Privilege]
Bulletin Number
--------------------------------------------------------------
MS07-018 (Critical) Content Management Server 2001 and 2002 [Remote Code Execution]
MS07-019 (Critical) Windows XP [Remote Code Execution]
MS07-020 (Critical) Windows 2000, Windows XP, Windows Server 2003 [Remote Code Execution]
MS07-021 (Critical) All current versions of Microsoft Windows [Remote Code Execution]
MS07-022 (Important)Windows 2000, Windows XP, Windows Server 2003 [Elevation of Privilege]
Almost all are critical and it's important to patch promptly:
Microsoft Security Bulletins - April 2007
http://www.microsoft.com/technet/security/...n/ms07-Apr.mspx