{
    "id": "CVE-2017-5447",
    "published": "2018-06-11 21:29:06",
    "last_modified": "2026-06-17 01:20:30",
    "cvss_score": "9.1",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.0",
    "cvss_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
    "cwe": "CWE-416",
    "description": "An out-of-bounds read during the processing of glyph widths during text layout. This results in a potentially exploitable crash and could allow an attacker to read otherwise inaccessible memory. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.",
    "epss_score": "0.17314",
    "epss_percentile": "0.97012",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-09-27 18:17:19",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "debian",
            "product": "debian_linux"
        },
        {
            "vendor": "mozilla",
            "product": "firefox"
        },
        {
            "vendor": "mozilla",
            "product": "thunderbird"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_desktop"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_server"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_server_aus"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_server_eus"
        },
        {
            "vendor": "redhat",
            "product": "enterprise_linux_workstation"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "42071",
            "title": "Mozilla Firefox < 53 - 'gfxTextRun' Out-of-Bounds Read",
            "date": "2017-05-25",
            "url": "https://www.exploit-db.com/exploits/42071"
        }
    ],
    "refs_list": [
        "http://www.securityfocus.com/bid/97940",
        "http://www.securitytracker.com/id/1038320",
        "https://access.redhat.com/errata/RHSA-2017:1104",
        "https://access.redhat.com/errata/RHSA-2017:1106",
        "https://access.redhat.com/errata/RHSA-2017:1201",
        "https://bugzilla.mozilla.org/show_bug.cgi?id=1343552",
        "https://www.debian.org/security/2017/dsa-3831",
        "https://www.exploit-db.com/exploits/42071/",
        "https://www.mozilla.org/security/advisories/mfsa2017-10/",
        "https://www.mozilla.org/security/advisories/mfsa2017-11/",
        "https://www.mozilla.org/security/advisories/mfsa2017-12/",
        "https://www.mozilla.org/security/advisories/mfsa2017-13/",
        "http://www.securityfocus.com/bid/97940",
        "http://www.securitytracker.com/id/1038320",
        "https://access.redhat.com/errata/RHSA-2017:1104",
        "https://access.redhat.com/errata/RHSA-2017:1106",
        "https://access.redhat.com/errata/RHSA-2017:1201",
        "https://bugzilla.mozilla.org/show_bug.cgi?id=1343552",
        "https://www.debian.org/security/2017/dsa-3831",
        "https://www.exploit-db.com/exploits/42071/",
        "https://www.mozilla.org/security/advisories/mfsa2017-10/",
        "https://www.mozilla.org/security/advisories/mfsa2017-11/",
        "https://www.mozilla.org/security/advisories/mfsa2017-12/",
        "https://www.mozilla.org/security/advisories/mfsa2017-13/"
    ]
}