WebKit, as used in Apple Safari before 6.1.3 and 7.x before 7.0.3, allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site, a different vulnerability than other WebKit CVEs listed in APPLE-SA-2014-04-01-1.
https://support.apple.com/kb/HT6537
http://archives.neohapsis.com/archives/bugtraq/2014-04/0009.html