5,198 Linux, Windows OS Flaws in 2005
The United States Computer Emergency Readiness Team released its year-end summary of computer vulnerabilities. While Windows is regarded as the most insecure operating system, the US-CERT found four times as many vulnerabilities specifically related to Unix and Linux. Of 5,198 reported flaws, 812 were for the Windows, 2,328 for Unix and Linux, and 2,058 more affected more than one operating system.
Notably missing from the list of Windows vulnerabilities is the recently discovered Windows Metafile issue. No vulnerabilities were listed for Apple's Mac OS X, however several had been disclosed during the year. Also, since OS X is based on Unix, it is vulnerable to some of the flaws associated with its core operating system.