One of the most critical verified vectors in PHP 5.6.40 involves the misuse of the unserialize() function.

Templates & Artifacts to produce (included in the study)

If you absolutely cannot upgrade your code, switch from standard vanilla PHP 5.6.40 to a commercial or community repository that backports security fixes:

This content is structured for a technical blog post, a security advisory, or an IT management report.

Version 5.6.40 was designed to be the most stable version of PHP 5, but its age now makes it a prime target for automated scanning tools. PHP 5.6.40 Release Announcement

php -i | grep "Build Date"

vulnerability that allows remote unauthenticated attackers to execute arbitrary code on Windows servers using Apache and PHP-CGI

: Multiple instances of heap-based buffer overflows were found in multibyte string regular expression functions, potentially allowing a remote attacker to compromise a system via crafted regular expressions.

The PHP development team officially stopped supporting PHP 5.6 in December 2018, with 5.6.40 being an emergency wrap-up. No new public patches will be issued for new flaws like CVE-2024-24260.

PHP 5.6.40 (cli) (built: Jan 10 2019 12:00:00)

Vulnerabilities in phar-reading functions that could expose sensitive data. Risks of Running PHP 5.6.40

Unauthorized access to customer databases and intellectual property. Immediate violation of PCI-DSS, HIPAA, and GDPR frameworks. Ransomware

Run tools like OpenVAS, Nessus, or Qualys against your infrastructure to identify active EOL PHP headers and associated CVEs. Mitigation and Remediation Strategies