CVE-2015-9253: PHP

Medium severity, CVSS 6.5. EPSS: 4.2% chance of exploitation in the next 30 days.

An issue was discovered in PHP 7.3.x before 7.3.0alpha3, 7.2.x before 7.2.8, and before 7.1.20. The php-fpm master process restarts a child process in an endless loop when using program execution functions (e.g., passthru, exec, shell_exec, or system) with a non-blocking STDIN stream, causing this master process to consume 100% of the CPU, and consume disk space with a large volume of error logs, as demonstrated by an attack by a customer of a shared-hosting facility.

Affected products

• PHP PHP: before 7.1.20 (fixed in 7.1.20); from 7.2.0, before 7.2.8 (fixed in 7.2.8); version 7.3.0 only

Published 2018-02-19. Last modified 2026-06-17.