"Kaspersky Lab detection systems are still registering tens of millions of detections of CVE-2010-2568 exploits. Over the study period, more than 50 million detections on more than 19 million computers worldwide were recorded," Kaspersky said in its Security Network Report.
In autumn 2010, Microsoft has released a security update to patch (fix) this vulnerability.
The report said that the malware to sabotage Iran's nuclear programme used an "exploit" (loophole) for the CVE-2010-2568 vulnerability.
The security firm's research has found India is among top three countries, followed by Vietnam and Algeria, where most of the computer systems have this vulnerability.
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"Vietnam (42.45 per cent), India (11.7 per cent) and Algeria (5.52 per cent) are among the leaders for the number of Kaspersky Lab detections of one of the most dangerous Windows vulnerabilities currently known," the report said.
It has been reportedly said that US surveillance agency NSA has been using these exploits from snooping purposes.
Kaspersky said that a lion's share of detections (64.19 per cent), registered over the last eight months involved Windows XP, for which the Microsoft has completely ended support, and 27.99 per cent were on Windows 7.
As per the report, out of these 65 per cent XP users, about 27 per cent are in India.