{
    "id": "CVE-2018-20020",
    "published": "2018-12-19 16:29:00",
    "last_modified": "2026-06-17 01:52:10",
    "cvss_score": "9.8",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.0",
    "cvss_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "cwe": "CWE-787",
    "description": "LibVNC before commit 7b1ef0ffc4815cab9a96c7278394152bdc89dc4d contains heap out-of-bound write vulnerability inside structure in VNC client code that can result remote code execution",
    "epss_score": "0.08622",
    "epss_percentile": "0.94953",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-05 18:17:18",
    "priority": {
        "rank": 3,
        "label": "In your normal cycle",
        "why": "Critical by CVSS (9.8), but no sign of active exploitation."
    },
    "products": [
        {
            "vendor": "canonical",
            "product": "ubuntu_linux"
        },
        {
            "vendor": "debian",
            "product": "debian_linux"
        },
        {
            "vendor": "libvnc_project",
            "product": "libvncserver"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-030-libvnc-heap-out-of-bound-write/",
        "https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html",
        "https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html",
        "https://lists.debian.org/debian-lts-announce/2019/11/msg00033.html",
        "https://security.gentoo.org/glsa/201908-05",
        "https://security.gentoo.org/glsa/202006-06",
        "https://usn.ubuntu.com/3877-1/",
        "https://usn.ubuntu.com/4547-1/",
        "https://usn.ubuntu.com/4547-2/",
        "https://usn.ubuntu.com/4587-1/",
        "https://www.debian.org/security/2019/dsa-4383",
        "https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-030-libvnc-heap-out-of-bound-write/",
        "https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html",
        "https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html",
        "https://lists.debian.org/debian-lts-announce/2019/11/msg00033.html",
        "https://security.gentoo.org/glsa/201908-05",
        "https://security.gentoo.org/glsa/202006-06",
        "https://usn.ubuntu.com/3877-1/",
        "https://usn.ubuntu.com/4547-1/",
        "https://usn.ubuntu.com/4547-2/",
        "https://usn.ubuntu.com/4587-1/",
        "https://www.debian.org/security/2019/dsa-4383"
    ]
}