{
    "id": "CVE-2009-4086",
    "published": "2009-11-29 13:07:34",
    "last_modified": "2026-06-16 23:13:00",
    "cvss_score": "5.0",
    "cvss_severity": "MEDIUM",
    "cvss_version": "2.0",
    "cvss_vector": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
    "cwe": "CWE-20",
    "description": "CRLF injection vulnerability in Xerver HTTP Server 4.31 and 4.32 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via certain byte sequences at the end of a URL.  NOTE: some of these details are obtained from third party information.",
    "epss_score": "0.04765",
    "epss_percentile": "0.91635",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-10-03 18:17:09",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "javascript",
            "product": "xerver_http_server"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "10170",
            "title": "Xerver 4.31/4.32 - HTTP Response Splitting",
            "date": "2009-11-18",
            "url": "https://www.exploit-db.com/exploits/10170"
        }
    ],
    "refs_list": [
        "http://packetstormsecurity.org/0911-exploits/xerver-split.txt",
        "http://secunia.com/advisories/36681",
        "http://www.securityfocus.com/bid/37064",
        "https://exchange.xforce.ibmcloud.com/vulnerabilities/54356",
        "http://packetstormsecurity.org/0911-exploits/xerver-split.txt",
        "http://secunia.com/advisories/36681",
        "http://www.securityfocus.com/bid/37064",
        "https://exchange.xforce.ibmcloud.com/vulnerabilities/54356"
    ]
}