{
    "id": "CVE-2012-4787",
    "published": "2012-12-12 00:55:01",
    "last_modified": "2026-06-16 23:45:42",
    "cvss_score": "9.0",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
    "cwe": "CWE-399",
    "description": "Use-after-free vulnerability in Microsoft Internet Explorer 9 and 10 allows remote attackers to execute arbitrary code via a crafted web site that triggers access to an object that (1) was not properly initialized or (2) is deleted, aka \"Improper Ref Counting Use After Free Vulnerability.\"",
    "epss_score": "0.17572",
    "epss_percentile": "0.97061",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-03 18:17:11",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "EPSS 17.6% — above the 10% action threshold."
    },
    "products": [
        {
            "vendor": "microsoft",
            "product": "internet_explorer"
        },
        {
            "vendor": "microsoft",
            "product": "windows_7"
        },
        {
            "vendor": "microsoft",
            "product": "windows_8"
        },
        {
            "vendor": "microsoft",
            "product": "windows_rt"
        },
        {
            "vendor": "microsoft",
            "product": "windows_server_2008"
        },
        {
            "vendor": "microsoft",
            "product": "windows_server_2012"
        },
        {
            "vendor": "microsoft",
            "product": "windows_vista"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "http://www.us-cert.gov/cas/techalerts/TA12-346A.html",
        "https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-077",
        "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16211",
        "http://www.us-cert.gov/cas/techalerts/TA12-346A.html",
        "https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-077",
        "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16211"
    ]
}