As we have notified in our preview of Microsoft Patch Tuesday 2011, this month’s patch Tuesday brings only 4 Bulletins as compared to 16 previous months. A total of 22 vulnerabilities are fixed in these 4 bulletins. Out of 4 bulletins 1 is rated Critical and rest 3 as “Important”.  Almost all of the bulletins requires user to restart their system after the fixes are implemented.

MS11-053/KB2532531 – Rated – Critical – The security update fixes vulnerability in Windows Bluetooth stack which can allow remote code execution attack by sending a bad network packet. It is a must install patch even if you do not use a Bluetooth device.

Affects :- Windows 7, Windows Vista

MS11-054/KB2555917 – Rated – Important – This single bulletin fixes fifteen vulnerabilities escalation of privilege vulnerability in Windows Operating System.

Affects :- Windows Xp, Vista, Win 7, 2003, 2008, 2008 R2

MS11-055/KB2560847 – Rated – Important – The security patch fixes a  library loading exploit in Microsoft Visio SP3, which can allows remote code execution attack if user is trapped into to open a file on a remote location.

Affects :- Visio 2001 SP3

MS11-056/KB2507938 – Rated – Important – This update resolves around five vulnerabilities found in Client/Server Run-time Subsystem. Nearly all the Windows Operating Systems are affected by it. All these exploits can only be used if attacker is logged locally into your system.

Affects :- Windows Xp, Win7, Windows Vista, Win 2003, 2008, 2008 R2

Important Service Packs


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