Symantec Global internet Security threat report
this metric will examine the window of exposure for the following Web browsers:92
Microsoft internet Explorer
in 2009, the average window of exposure for Safari was 13 days, based on a sample set of 78 patched vulnerabilities (figure 8). it should be noted that there are now full versions of Safari for both Macintosh® and Windows. the window of exposure for Safari in 2008 was nine days, based on a sample set of 31 patched vulnerabilities. the maximum time for Apple to patch a Safari vulnerability in 2009 was 145 days. the maximum time to release a patch in 2008 was 156 days.
Safari Internet Explorer Chrome Opera Firefox
Average time in days
Figure 8. Window of exposure for Web browsers Source: Symantec
it should be noted that this metric examines all versions of each browser; vulnerabilities affecting multiple versions of a browser are counted as a single vulnerability.