Computers running unpatched Windows operating systems in the US rose to 9.8% in the first quarter, up from 6.5% a year ago, according to the Country Report released this week by Secunia [email protected] The data also revealed that while unpatched Windows OS was on the rise, the percentage of vulnerabilities that started in the OS in the US also grew to 36% in the first quarter, from 21% a year ago. These statistics may seem surprising, given that 81% of vulnerabilities in all products last year had patches available on the day they were disclosed, according to Flexera’s annual Vulnerability Review.

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