{"cve":"CVE-2009-3294","nvd":{"published":"2009-09-22T10:30:00.827","modified":"2026-06-16T23:11:19.653","status":"Modified","description":"The popen API function in TSRM/tsrm_win32.c in PHP before 5.2.11 and 5.3.x before 5.3.1, when running on certain Windows operating systems, allows context-dependent attackers to cause a denial of service (crash) via a crafted (1) \"e\" or (2) \"er\" string in the second argument (aka mode), possibly related to the _fdopen function in the Microsoft C runtime library. NOTE: this might not cross privilege boundaries except in rare cases in which the mode argument is accessible to an attacker outside of an application that uses the popen function.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-134"],"references":["http://bugs.php.net/bug.php?id=44683","http://news.php.net/php.announce/79","http://svn.php.net/viewvc?view=revision&revision=287779","http://www.openwall.com/lists/oss-security/2009/09/20/1","http://www.openwall.com/lists/oss-security/2009/11/20/2"],"products":["php:php"],"source":"nvd","synced_at":"2026-10-19T19:54:26.868835795+00:00"},"epss":{"cve":"CVE-2009-3294","score":0.02731,"percentile":0.86091,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}