{"cve":"CVE-2012-4388","nvd":{"published":"2012-09-07T22:55:02.883","modified":"2026-06-16T23:44:55.430","status":"Modified","description":"The sapi_header_op function in main/SAPI.c in PHP 5.4.0RC2 through 5.4.0 does not properly determine a pointer during checks for %0D sequences (aka carriage return characters), which allows remote attackers to bypass an HTTP response-splitting protection mechanism via a crafted URL, related to improper interaction between the PHP header function and certain browsers, as demonstrated by Internet Explorer and Google Chrome.  NOTE: this vulnerability exists because of an incorrect fix for CVE-2011-1398.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-20"],"references":["http://article.gmane.org/gmane.comp.php.devel/70584","http://lists.opensuse.org/opensuse-security-announce/2013-08/msg00006.html","http://openwall.com/lists/oss-security/2012/08/29/5","http://openwall.com/lists/oss-security/2012/09/02/1","http://openwall.com/lists/oss-security/2012/09/05/15"],"products":["canonical:ubuntu_linux","debian:debian_linux","php:php"],"source":"nvd","synced_at":"2026-10-19T20:25:53.526315492+00:00"},"epss":{"cve":"CVE-2012-4388","score":0.04225,"percentile":0.91007,"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."]}