{
    "id": "CVE-2020-5656",
    "published": "2020-11-02 21:15:33",
    "last_modified": "2026-06-17 03:22:02",
    "cvss_score": "9.8",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "cwe": null,
    "description": "Improper access control vulnerability in TCP/IP function included in the firmware of MELSEC iQ-R series (RJ71EIP91 EtherNet/IP Network Interface Module First 2 digits of serial number are '02' or before, RJ71PN92 PROFINET IO Controller Module First 2 digits of serial number are '01' or before, RD81DL96 High Speed Data Logger Module First 2 digits of serial number are '08' or before, RD81MES96N MES Interface Module First 2 digits of serial number are '04' or before, and RD81OPC96 OPC UA Server Module First 2 digits of serial number are '04' or before) allows a remote unauthenticated attacker to stop the network functions of the products or execute a malicious program via a specially crafted packet.",
    "epss_score": "0.02969",
    "epss_percentile": "0.86873",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-11 18:17:24",
    "priority": {
        "rank": 3,
        "label": "In your normal cycle",
        "why": "Critical by CVSS (9.8), but no sign of active exploitation."
    },
    "products": [
        {
            "vendor": "mitsubishielectric",
            "product": "melsec_iq-rd81dl96"
        },
        {
            "vendor": "mitsubishielectric",
            "product": "melsec_iq-rd81dl96_firmware"
        },
        {
            "vendor": "mitsubishielectric",
            "product": "melsec_iq-rd81mes96n"
        },
        {
            "vendor": "mitsubishielectric",
            "product": "melsec_iq-rd81mes96n_firmware"
        },
        {
            "vendor": "mitsubishielectric",
            "product": "melsec_iq-rd81opc96"
        },
        {
            "vendor": "mitsubishielectric",
            "product": "melsec_iq-rd81opc96_firmware"
        },
        {
            "vendor": "mitsubishielectric",
            "product": "melsec_iq-rj71eip91"
        },
        {
            "vendor": "mitsubishielectric",
            "product": "melsec_iq-rj71eip91_firmware"
        },
        {
            "vendor": "mitsubishielectric",
            "product": "melsec_iq-rj71pn92"
        },
        {
            "vendor": "mitsubishielectric",
            "product": "melsec_iq-rj71pn92_firmware"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "https://jvn.jp/vu/JVNVU92513419/index.html",
        "https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-012.pdf",
        "https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-012_en.pdf",
        "https://jvn.jp/vu/JVNVU92513419/index.html",
        "https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-012.pdf",
        "https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-012_en.pdf"
    ]
}