This bulletin summary lists security bulletins released for April 2012.
With the release of the security bulletins for April 2012, this bulletin summary replaces the bulletin advance notification originally issued April 10th, 2012. For more information about the bulletin advance notification service, see Microsoft Security Bulletin Advance Notification.
For information about how to receive automatic notifications whenever Microsoft security bulletins are issued, visit Microsoft Technical Security Notifications.
| Windows XP | |||
|---|---|---|---|
| Bulletin Identifier | Bulletin 1 | Bulletin 2 | Bulletin 3 |
| Aggregate Severity Rating | Critical | Critical | Critical |
| Windows XP Service Pack 3 | Internet Explorer 6 (Critical)Internet Explorer 7 (Critical)Internet Explorer 8 (Critical) |
Windows XP Service Pack 3 (Critical) |
Windows XP Service Pack 3 (Critical) |
| Windows XP Professional x64 Edition Service Pack 2 | Internet Explorer 6 (Critical)Internet Explorer 7 (Critical)Internet Explorer 8 (Critical) |
Windows XP Professional x64 Edition Service Pack 2 (Critical) |
Windows XP Professional x64 Edition Service Pack 2 (Critical) |
| Windows Server 2003 | |||
| Bulletin Identifier | Bulletin 1 | Bulletin 2 | Bulletin 3 |
| Aggregate Severity Rating | Moderate | Critical | Critical |
| Windows Server 2003 Service Pack 2 | Internet Explorer 6 (Moderate)Internet Explorer 7 (Moderate)Internet Explorer 8 (Moderate) |
Windows Server 2003 Service Pack 2 (Critical) |
Windows Server 2003 Service Pack 2 (Critical) |
| Windows Server 2003 x64 Edition Service Pack 2 | Internet Explorer 6 (Moderate)Internet Explorer 7 (Moderate)Internet Explorer 8 (Moderate) |
Windows Server 2003 x64 Edition Service Pack 2 (Critical) |
Windows Server 2003 x64 Edition Service Pack 2 (Critical) |
| Windows Server 2003 with SP2 for Itanium-based Systems | Internet Explorer 6 (Moderate)Internet Explorer 7 (Moderate) |
Windows Server 2003 with SP2 for Itanium-based Systems (Critical) |
Windows Server 2003 with SP2 for Itanium-based Systems (Critical) |
| Windows Vista | |||
| Bulletin Identifier | Bulletin 1 | Bulletin 2 | Bulletin 3 |
| Aggregate Severity Rating | Critical | Critical | Critical |
| Windows Vista Service Pack 2 | Internet Explorer 7 (Critical)Internet Explorer 8 (Critical)Internet Explorer 9 (Critical) |
Windows Vista Service Pack 2 (Critical) |
Windows Vista Service Pack 2 (Critical) |
| Windows Vista x64 Edition Service Pack 2 | Internet Explorer 7 (Critical)Internet Explorer 8 (Critical)Internet Explorer 9 (Critical) |
Windows Vista x64 Edition Service Pack 2 (Critical) |
Windows Vista x64 Edition Service Pack 2 (Critical) |
| Windows Server 2008 | |||
| Bulletin Identifier | Bulletin 1 | Bulletin 2 | Bulletin 3 |
| Aggregate Severity Rating | Moderate | Critical | Critical |
| Windows Server 2008 for 32-bit Systems Service Pack 2 | Internet Explorer 7** (Moderate)Internet Explorer 8** (Moderate)Internet Explorer 9** (Moderate) |
Windows Server 2008 for 32-bit Systems Service Pack 2* (Critical) |
Windows Server 2008 for 32-bit Systems Service Pack 2 (Critical) |
| Windows Server 2008 for x64-based Systems Service Pack 2 | Internet Explorer 7** (Moderate)Internet Explorer 8** (Moderate)Internet Explorer 9** (Moderate) |
Windows Server 2008 for x64-based Systems Service Pack 2* (Critical) |
Windows Server 2008 for x64-based Systems Service Pack 2 (Critical) |
| Windows Server 2008 for Itanium-based Systems Service Pack 2 | Internet Explorer 7 (Moderate) |
Windows Server 2008 for Itanium-based Systems Service Pack 2 (Critical) |
Windows Server 2008 for Itanium-based Systems Service Pack 2 (Critical) |
| Windows 7 | |||
| Bulletin Identifier | Bulletin 1 | Bulletin 2 | Bulletin 3 |
| Aggregate Severity Rating | Critical | Critical | Critical |
| Windows 7 for 32-bit Systems | Internet Explorer 8 (Critical)Internet Explorer 9 (Critical) |
Windows 7 for 32-bit Systems (Critical) |
Windows 7 for 32-bit Systems (Critical) |
| Windows 7 for 32-bit Systems Service Pack 1 | Internet Explorer 8 (Critical)Internet Explorer 9 (Critical) |
Windows 7 for 32-bit Systems Service Pack 1 (Critical) |
Windows 7 for 32-bit Systems Service Pack 1 (Critical) |
| Windows 7 for x64-based Systems | Internet Explorer 8 (Critical)Internet Explorer 9 (Critical) |
Windows 7 for x64-based Systems (Critical) |
Windows 7 for x64-based Systems (Critical) |
| Windows 7 for x64-based Systems Service Pack 1 | Internet Explorer 8 (Critical)Internet Explorer 9 (Critical) |
Windows 7 for x64-based Systems Service Pack 1 (Critical) |
Windows 7 for x64-based Systems Service Pack 1 (Critical) |
| Windows Server 2008 R2 | |||
| Bulletin Identifier | Bulletin 1 | Bulletin 2 | Bulletin 3 |
| Aggregate Severity Rating | Moderate | Critical | Critical |
| Windows Server 2008 R2 for x64-based Systems | Internet Explorer 8** (Moderate)Internet Explorer 9** (Moderate) |
Windows Server 2008 R2 for x64-based Systems* (Critical) |
Windows Server 2008 R2 for x64-based Systems* (Critical) |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 | Internet Explorer 8** (Moderate)Internet Explorer 9** (Moderate) |
Windows Server 2008 R2 for x64-based Systems Service Pack 1* (Critical) |
Windows Server 2008 R2 for x64-based Systems Service Pack 1* (Critical) |
| Windows Server 2008 R2 for Itanium-based Systems | Internet Explorer 8 (Moderate) |
Windows Server 2008 R2 for Itanium-based Systems (Critical) |
Windows Server 2008 R2 for Itanium-based Systems (Critical) |
| Windows Server 2008 R2 for Itanium-based Systems Service Pack 1 | Internet Explorer 8 (Moderate) |
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1 (Critical) |
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1 (Critical) |
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