The specific version of PHP that the server is running is vulnerable to a user-after-free remote code execution.
PHP contains a use-after-free error in the garbage collection algorithm in ext/spl/spl_array.c. This may allow a remote attacker to dereference already freed memory and potentially execute arbitrary code. Technical Information: This issue was introduced in version 5.3.0. Note: Programming language vulnerability. This code is used in a wide variety of software and the issue may manifest in a number of different ways. This issue is reportedly not exploitable in the 7.x branch, though it still appeared as fixed in version 7.0.8's changelog.
It has been reported that this has been fixed. Please refer to the product listing for upgraded versions that address this vulnerability.