{
    "id": "CVE-2017-7783",
    "published": "2018-06-11 21:29:09",
    "last_modified": "2026-06-17 01:25:11",
    "cvss_score": "7.5",
    "cvss_severity": "HIGH",
    "cvss_version": "3.0",
    "cvss_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
    "cwe": "CWE-20",
    "description": "If a long user name is used in a username/password combination in a site URL (such as \" http://UserName:Password@example.com\"), the resulting modal prompt will hang in a non-responsive state or crash, causing a denial of service. This vulnerability affects Firefox < 55.",
    "epss_score": "0.14120",
    "epss_percentile": "0.96468",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-10-02 18:17:19",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "mozilla",
            "product": "firefox"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "43020",
            "title": "Mozilla Firefox < 55 - Denial of Service",
            "date": "2017-10-20",
            "url": "https://www.exploit-db.com/exploits/43020"
        }
    ],
    "refs_list": [
        "http://www.securityfocus.com/bid/100401",
        "http://www.securitytracker.com/id/1039124",
        "https://bugzilla.mozilla.org/show_bug.cgi?id=1360842",
        "https://www.exploit-db.com/exploits/43020/",
        "https://www.mozilla.org/security/advisories/mfsa2017-18/",
        "http://www.securityfocus.com/bid/100401",
        "http://www.securitytracker.com/id/1039124",
        "https://bugzilla.mozilla.org/show_bug.cgi?id=1360842",
        "https://www.exploit-db.com/exploits/43020/",
        "https://www.mozilla.org/security/advisories/mfsa2017-18/"
    ]
}