{
    "id": "CVE-2011-1398",
    "published": "2012-08-30 22:55:02",
    "last_modified": "2026-06-16 23:29:16",
    "cvss_score": "4.3",
    "cvss_severity": "MEDIUM",
    "cvss_version": "2.0",
    "cvss_vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
    "cwe": "CWE-20",
    "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.",
    "epss_score": "0.10173",
    "epss_percentile": "0.95512",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-09-28 18:17:09",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "php",
            "product": "php"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "37688",
            "title": "PHP 5.3.11/5.4.0RC2 - 'header()' HTTP Header Injection",
            "date": "2011-10-06",
            "url": "https://www.exploit-db.com/exploits/37688"
        }
    ],
    "refs_list": [
        "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/2012/09/05/15",
        "http://rhn.redhat.com/errata/RHSA-2013-1307.html",
        "http://secunia.com/advisories/55078",
        "http://security-tracker.debian.org/tracker/CVE-2011-1398",
        "http://www.securitytracker.com/id?1027463",
        "http://www.ubuntu.com/usn/USN-1569-1",
        "https://bugs.php.net/bug.php?id=60227",
        "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/2012/09/05/15",
        "http://rhn.redhat.com/errata/RHSA-2013-1307.html",
        "http://secunia.com/advisories/55078",
        "http://security-tracker.debian.org/tracker/CVE-2011-1398",
        "http://www.securitytracker.com/id?1027463",
        "http://www.ubuntu.com/usn/USN-1569-1",
        "https://bugs.php.net/bug.php?id=60227"
    ]
}