CVE-2013-3735

CVE-2013-3735 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The Zend Engine in PHP before 5.4.16 RC1, and 5.5.0 before RC2, does not properly determine whether a parser error occurred, which allows context-dependent attackers to cause a denial of service (memory consumption and application crash) via a crafted function definition, as demonstrated by an attack within a shared web-hosting environment. NOTE: the vendor's http://php.net/security-note.php page says "for critical security situations you should be using OS-level security by running multiple web servers each as their own user id.. EPSS estimates a 2.83% chance of exploitation in the next 30 days.