Attackers often clone popular PHP repos and inject backdoors named "5416" to hide.
Many repositories contain Ruby scripts that integrate with Metasploit Framework. The most famous module is exploit/multi/http/php_cgi_arg_injection. You will find this module referenced in security toolkits. php 5416 exploit github
The simplest solution. PHP 5.3.13 and 5.4.3 patched this vulnerability. However, you should move to a supported version (PHP 8.0+). Unsupported PHP versions are a liability. Attackers often clone popular PHP repos and inject
Vulnerability scanners sometimes report errors by line number in the PHP source code. In older versions of PHP (7.0.x - 7.1.x), line 5416 in Zend/zend_vm_def.h or ext/standard/string.c related to heap overflow vulnerabilities. Specifically, researchers have linked line 5416 to a buffer overflow in the php_raw_url_encode function. php 5416 exploit github