{"id":"CVE-2011-1398","url":"https://www.cyber-defence.io/tools/cve/CVE-2011-1398","generatedAt":"2026-11-05T08:10:53.086Z","title":"The sapi_header_op function in main/SAPI.c in PHP before 5.3.11 and 5.4.x before 5.4.0RC2 does not check for %0D sequences (aka carriage return characters), which allows remote attackers to bypass an HTTP response-splitting protection mechanism via a…","description":"The sapi_header_op function in main/SAPI.c in PHP before 5.3.11 and 5.4.x before 5.4.0RC2 does not check 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.","published":"2012-08-30T22:55:02.000Z","lastModified":"2026-06-16T23:29:16.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"2.0","score":4.3,"severity":"MEDIUM","vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N"},"cwe":["CWE-20"],"affected":["php/php"],"epss":{"score":0.10173,"percentile":0.95676,"date":"2026-11-04","history":[]},"kev":{"listed":false},"exploits":{"count":1,"verified":true,"firstPublished":"2011-10-06","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":37688,"kind":"exploit","title":"PHP 5.3.11/5.4.0RC2 - 'header()' HTTP Header Injection","url":"https://www.exploit-db.com/exploits/37688","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/php/remote/37688.txt","file":"exploits/php/remote/37688.txt","published":"2011-10-06","added":"2011-10-06","updated":"2016-12-01","author":"Mr. Tokumaru","type":"remote","platform":"php","port":null,"verified":true,"codes":["CVE-2011-1398","OSVDB-85086"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":"https://www.securityfocus.com/bid/55297/info"}]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 10.2%, higher than 96% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://article.gmane.org/gmane.comp.php.devel/70584","source":"cve@mitre.org"},{"url":"http://lists.opensuse.org/opensuse-security-announce/2013-08/msg00006.html","source":"cve@mitre.org"},{"url":"http://openwall.com/lists/oss-security/2012/08/29/5","source":"cve@mitre.org"},{"url":"http://openwall.com/lists/oss-security/2012/09/05/15","source":"cve@mitre.org"},{"url":"http://rhn.redhat.com/errata/RHSA-2013-1307.html","source":"cve@mitre.org"},{"url":"http://secunia.com/advisories/55078","source":"cve@mitre.org"},{"url":"http://security-tracker.debian.org/tracker/CVE-2011-1398","source":"cve@mitre.org"},{"url":"http://www.securitytracker.com/id?1027463","source":"cve@mitre.org"},{"url":"http://www.ubuntu.com/usn/USN-1569-1","source":"cve@mitre.org"},{"url":"https://bugs.php.net/bug.php?id=60227","source":"cve@mitre.org"},{"url":"http://article.gmane.org/gmane.comp.php.devel/70584","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://lists.opensuse.org/opensuse-security-announce/2013-08/msg00006.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://openwall.com/lists/oss-security/2012/08/29/5","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://openwall.com/lists/oss-security/2012/09/05/15","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://rhn.redhat.com/errata/RHSA-2013-1307.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://secunia.com/advisories/55078","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://security-tracker.debian.org/tracker/CVE-2011-1398","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id?1027463","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.ubuntu.com/usn/USN-1569-1","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugs.php.net/bug.php?id=60227","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2011-1398","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."}