PHP contains a flaw that may allow a context-dependent denial of service. The issue is triggered when a use-after-free error in the Zend engine occurs, allowing a context-dependent attacker to use vectors related to the '__set', '__get', '__isset' and '__unset' methods to cause a denial of service, or possibly have other unspecified impact.
Local / Remote,
Denial of Service,
Loss of Availability
Upgrade to version 5.2.15, 5.3.4 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.