{
    "id": "CVE-2018-3991",
    "published": "2019-02-05 23:29:00",
    "last_modified": "2026-06-17 01:58:10",
    "cvss_score": "10.0",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.0",
    "cvss_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
    "cwe": "CWE-787",
    "description": "An exploitable heap overflow vulnerability exists in the WkbProgramLow function of WibuKey Network server management, version 6.40.2402.500. A specially crafted TCP packet can cause a heap overflow, potentially leading to remote code execution. An attacker can send a malformed TCP packet to trigger this vulnerability.",
    "epss_score": "0.34329",
    "epss_percentile": "0.98366",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-02 18:17:22",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "EPSS 34.3% — above the 10% action threshold."
    },
    "products": [
        {
            "vendor": "microsoft",
            "product": "windows"
        },
        {
            "vendor": "siemens",
            "product": "simatic_wincc_open_architecture"
        },
        {
            "vendor": "wibu",
            "product": "wibukey"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "http://www.securityfocus.com/bid/107005",
        "https://cert-portal.siemens.com/productcert/pdf/ssa-760124.pdf",
        "https://cert-portal.siemens.com/productcert/pdf/ssa-844562.pdf",
        "https://cert-portal.siemens.com/productcert/pdf/ssa-902727.pdf",
        "https://talosintelligence.com/vulnerability_reports/TALOS-2018-0659",
        "http://www.securityfocus.com/bid/107005",
        "https://cert-portal.siemens.com/productcert/pdf/ssa-760124.pdf",
        "https://cert-portal.siemens.com/productcert/pdf/ssa-844562.pdf",
        "https://cert-portal.siemens.com/productcert/pdf/ssa-902727.pdf",
        "https://talosintelligence.com/vulnerability_reports/TALOS-2018-0659"
    ]
}