The vulnerability of the PHP interpreter allows attackers to execute arbitrary code.

The vulnerability of the exception::getTraceAsString function in the PHP interpreter is related to errors in data type mixing. Exploiting this vulnerability could allow a remote attacker to execute arbitrary code...

CVE-2015-4603: Undefined Security Weakness

The exception::getTraceAsString function in Zend/zendexceptions.c in PHP before 5.4.40, 5.5.x before 5.5.24, and 5.6.x before 5.6.8 allows remote attackers to execute arbitrary code via an unexpected data type, related to a "type confusion" issue...