{"id":"CVE-2015-9253","url":"https://www.cyber-defence.io/tools/cve/CVE-2015-9253","generatedAt":"2026-10-27T18:47:06.328Z","title":"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…","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.","published":"2018-02-19T19:29:00.000Z","lastModified":"2026-06-17T00:36:09.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.0","score":6.5,"severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-400"],"affected":["php/php"],"epss":{"score":0.04176,"percentile":0.90842,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (4.18%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://bugs.php.net/bug.php?id=70185","tags":["Exploit","Issue Tracking","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://bugs.php.net/bug.php?id=73342https://github.com/php/php-src/pull/3287","tags":["Exploit","Issue Tracking","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://bugs.php.net/bug.php?id=75968","tags":["Exploit","Issue Tracking","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/php/php-src/blob/PHP-7.1.20/NEWS#L20-L22","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/php/php-src/commit/69dee5c732fe982c82edb17d0dbc3e79a47748d8","tags":["Patch","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://usn.ubuntu.com/3766-1/","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://usn.ubuntu.com/4279-1/","source":"cve@mitre.org"},{"url":"https://www.futureweb.at/security/CVE-2015-9253/","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://bugs.php.net/bug.php?id=70185","tags":["Exploit","Issue Tracking","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugs.php.net/bug.php?id=73342https://github.com/php/php-src/pull/3287","tags":["Exploit","Issue Tracking","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugs.php.net/bug.php?id=75968","tags":["Exploit","Issue Tracking","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/php/php-src/blob/PHP-7.1.20/NEWS#L20-L22","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/php/php-src/commit/69dee5c732fe982c82edb17d0dbc3e79a47748d8","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/3766-1/","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://usn.ubuntu.com/4279-1/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.futureweb.at/security/CVE-2015-9253/","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2015-9253","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}