How did you determine this?<p>Comparing the list at CVEDetails.com [1] [2] would seem to support this at first blush, but this is because the iOS list contains Safari and WebKit vulnerabilities, while the Android one does not include Chrome, Blink, or WebBrowser&#x2F;WebKit vulnerabilities.<p>If you include Chrome [3] they look to be about even.<p>[1] <a href="http:&#x2F;&#x2F;www.cvedetails.com&#x2F;product&#x2F;19997&#x2F;Google-Android.html?vendor_id=1224" rel="nofollow">http:&#x2F;&#x2F;www.cvedetails.com&#x2F;product&#x2F;19997&#x2F;Google-Android.html?...</a><p>[2] <a href="http:&#x2F;&#x2F;www.cvedetails.com&#x2F;product&#x2F;15556&#x2F;Apple-Iphone-Os.html?vendor_id=49" rel="nofollow">http:&#x2F;&#x2F;www.cvedetails.com&#x2F;product&#x2F;15556&#x2F;Apple-Iphone-Os.html...</a><p>[3] <a href="http:&#x2F;&#x2F;www.cvedetails.com&#x2F;product&#x2F;15031&#x2F;Google-Chrome.html?vendor_id=1224" rel="nofollow">http:&#x2F;&#x2F;www.cvedetails.com&#x2F;product&#x2F;15031&#x2F;Google-Chrome.html?v...</a>