This year a record 5,198 vulnerabilities were found in software products, this is almost 38 percent more than in 2004.
According to US-CERT, researchers found 812 flaws in the Windows operating system, 2,328 problems in various versions of the Unix/Linux operating systems (Mac included). An additional 2,058 flaws affected multiple operating systems. There may well have been more than 5,198 flaws discovered this year; these were only the ones reported to US-CERT.
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