Updated: 2025-08-20 00:25:28.321484
Description:
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.
| Links | NIST | CIRCL | RHEL | Ubuntu |
| Severity | Score | |
|---|---|---|
| CVSS Version 2.x | MEDIUM | 6.8 |
| CVSS Version 3.x | MEDIUM | 6.5 |
| OS name | Project name | Version | Score | Severity | Status | Errata | Last updated | Statement |
|---|---|---|---|---|---|---|---|---|
| Debian 10 ELS | php | 7.3 | 6.5 | MEDIUM | Ignored | 2025-10-11 00:17:59 | Ignored due to low severity | |
| Ubuntu 16.04 ELS | php | 7.0.33 | 6.5 | MEDIUM | Released | CLSA-2022:1646085834 | 2022-02-28 20:38:55 |