{
    "id": "CVE-2019-9813",
    "published": "2019-04-26 17:29:04",
    "last_modified": "2026-06-17 02:44:39",
    "cvss_score": "8.8",
    "cvss_severity": "HIGH",
    "cvss_version": "3.0",
    "cvss_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
    "cwe": "CWE-843",
    "description": "Incorrect handling of __proto__ mutations may lead to type confusion in IonMonkey JIT code and can be leveraged for arbitrary memory read and write. This vulnerability affects Firefox < 66.0.1, Firefox ESR < 60.6.1, and Thunderbird < 60.6.1.",
    "epss_score": "0.07387",
    "epss_percentile": "0.94252",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-10-05 18:17:21",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "mozilla",
            "product": "firefox"
        },
        {
            "vendor": "mozilla",
            "product": "thunderbird"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "46646",
            "title": "SpiderMonkey - IonMonkey Compiled Code Fails to Update Inferred Property Types (Type Confusion)",
            "date": "2019-04-03",
            "url": "https://www.exploit-db.com/exploits/46646"
        }
    ],
    "refs_list": [
        "https://access.redhat.com/errata/RHSA-2019:0966",
        "https://access.redhat.com/errata/RHSA-2019:1144",
        "https://bugzilla.mozilla.org/show_bug.cgi?id=1538006",
        "https://www.mozilla.org/security/advisories/mfsa2019-09/",
        "https://www.mozilla.org/security/advisories/mfsa2019-10/",
        "https://www.mozilla.org/security/advisories/mfsa2019-12/",
        "https://access.redhat.com/errata/RHSA-2019:0966",
        "https://access.redhat.com/errata/RHSA-2019:1144",
        "https://bugzilla.mozilla.org/show_bug.cgi?id=1538006",
        "https://www.mozilla.org/security/advisories/mfsa2019-09/",
        "https://www.mozilla.org/security/advisories/mfsa2019-10/",
        "https://www.mozilla.org/security/advisories/mfsa2019-12/"
    ]
}