{
    "id": "CVE-2011-4871",
    "published": "2012-04-18 10:33:31",
    "last_modified": "2026-06-16 23:35:33",
    "cvss_score": "5.0",
    "cvss_severity": "MEDIUM",
    "cvss_version": "2.0",
    "cvss_vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
    "cwe": "CWE-20",
    "description": "Open Automation Software OPC Systems.NET before 5.0 allows remote attackers to cause a denial of service via a malformed .NET RPC packet on TCP port 58723.",
    "epss_score": "0.03123",
    "epss_percentile": "0.87414",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-10-05 18:17:10",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "opcsystems",
            "product": "opcsystems.net"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "17965",
            "title": "OPC Systems.NET 4.00.0048 - Denial of Service",
            "date": "2011-10-10",
            "url": "https://www.exploit-db.com/exploits/17965"
        }
    ],
    "refs_list": [
        "http://www.us-cert.gov/control_systems/pdf/ICSA-12-012-01.pdf",
        "http://www.us-cert.gov/control_systems/pdf/ICSA-12-012-01.pdf"
    ]
}