Php 5.5.9 Exploit Here

PHP 5.5.9 is an outdated version of PHP that reached its end-of-life (EOL) in 2016. Because it no longer receives official security updates, it is highly susceptible to numerous known exploits that can lead to remote code execution (RCE), information disclosure, and denial of service (DoS). Critical Vulnerabilities in PHP 5.5.9

Several high-severity vulnerabilities impact PHP 5.5.9, often stemming from how it handles memory and serialized data. php5 5.5.9+dfsg-1ubuntu4.13 source package in Ubuntu php 5.5.9 exploit