{
    "id": "CVE-2017-8558",
    "published": "2017-06-29 13:29:00",
    "last_modified": "2026-06-17 01:26:34",
    "cvss_score": "7.8",
    "cvss_severity": "HIGH",
    "cvss_version": "3.0",
    "cvss_vector": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
    "cwe": "CWE-119",
    "description": "The Microsoft Malware Protection Engine running on Microsoft Forefront and Microsoft Defender on 32-bit versions of Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, and 1703 does not properly scan a specially crafted file leading to memory corruption. aka \"Microsoft Malware Protection Engine Remote Code Execution Vulnerability\".",
    "epss_score": "0.43588",
    "epss_percentile": "0.98698",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-09-26 18:21:37",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "microsoft",
            "product": "endpoint_protection"
        },
        {
            "vendor": "microsoft",
            "product": "forefront_endpoint_protection"
        },
        {
            "vendor": "microsoft",
            "product": "security_essentials"
        },
        {
            "vendor": "microsoft",
            "product": "windows_10"
        },
        {
            "vendor": "microsoft",
            "product": "windows_7"
        },
        {
            "vendor": "microsoft",
            "product": "windows_8.1"
        },
        {
            "vendor": "microsoft",
            "product": "windows_defender"
        },
        {
            "vendor": "microsoft",
            "product": "windows_intune_endpoint_protection"
        },
        {
            "vendor": "microsoft",
            "product": "windows_server_2008"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "42264",
            "title": "Microsoft MsMpEng - mpengine x86 Emulator Heap Corruption in VFS API",
            "date": "2017-06-27",
            "url": "https://www.exploit-db.com/exploits/42264"
        }
    ],
    "refs_list": [
        "http://www.securityfocus.com/bid/99262",
        "http://www.securitytracker.com/id/1038783",
        "http://www.securitytracker.com/id/1038784",
        "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8558",
        "https://www.exploit-db.com/exploits/42264/",
        "http://www.securityfocus.com/bid/99262",
        "http://www.securitytracker.com/id/1038783",
        "http://www.securitytracker.com/id/1038784",
        "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8558",
        "https://www.exploit-db.com/exploits/42264/"
    ]
}