On 8th December, Microsoft released the last security bulletins in 2009 for its software. In order for users to have an overall picture, Bkis has made a statistics about the number of these bulletins, their maximum severity rating and the operating systems affected during 2009.


Microsoft Security Bulletins and their severity for each month in 2009



Number of security bulletins per Operating System since the release of Windows 7.

According to the above charts, by and large, the number of security bulletins released in 2009 approximates that in the previous year – 2008. More precisely, there were a total of 74 bulletins (78 in 2008), more than half of which (44 bulletins) were rated critical which might “allow the propagation of an Internet worm without user action”, according to the security rating system of Microsoft. The number of bulletins per month reached its peak in October, with 13 bulletins, all of which were rated critical or important. In addition, it can be seen that more vulnerabilities were published and patched in the second half of the year than the first half.

Since October 2009, the numbers of bulletins per operating system were quite uniform except for that of Windows 7 and Windows 2008 R2, which has just been released by Microsoft near the end of the year, as the corporation has applied new advanced technologies to them. Yet it is still too soon to make any assumption that these new OSs are more secure than their predecessors since they have just entered the market for 2 months.

By Hoang Xuan Minh


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