Window of Exposure for Web Browsers

During the last six months of 2007, Mozilla had a window of exposure of three days based on a sample set of 82 patched vulnerabilities. This is a decrease from the window of exposure of five days in the first half of 2007, which was based on 22 patched vulnerabilities. In the second half of 2007, Microsoft Internet Explorer had a window of exposure of 11 days based on a sample set of 11 patched vulnerabilities. This is an increase from the five-day time period in the first half of 2007, which was based on a sample set of 17 patched vulnerabilities.

Symantec Internet Security Threat Report, Vol. XIII