After running automated scanners (e.g., Nessus, WPScan) and manual checks, the following vulnerabilities have been as present and exploitable in a default installation of PHP 5.6.40:
Industry regulatory standards strictly forbid running EOL software handling sensitive data: php version 5640 vulnerabilities verified
If your website processes credit card payments, running an EOL runtime with known, unpatched vulnerabilities guarantees a failure during a Payment Card Industry Data Security Standard (PCI-DSS) audit. This can lead to heavy fines or revocation of your merchant account. After running automated scanners (e
A heap-based buffer over-read in PHAR extension reading functions. After running automated scanners (e.g.
Protocol Downgrade / Side-Channel Attacks Impact: Medium to High
Using PHP 5.6.40 introduces major technical and legal vulnerabilities to an organization: