{
    "id": "CVE-2018-20748",
    "published": "2019-01-30 18:29:00",
    "last_modified": "2026-06-17 01:53:23",
    "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": "CWE-787",
    "description": "LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities in libvncclient/rfbproto.c. The fix for CVE-2018-20019 was incomplete.",
    "epss_score": "0.03257",
    "epss_percentile": "0.88038",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-10 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"
        },
        {
            "vendor": "siemens",
            "product": "simatic_itc1500"
        },
        {
            "vendor": "siemens",
            "product": "simatic_itc1500_firmware"
        },
        {
            "vendor": "siemens",
            "product": "simatic_itc1500_pro"
        },
        {
            "vendor": "siemens",
            "product": "simatic_itc1500_pro_firmware"
        },
        {
            "vendor": "siemens",
            "product": "simatic_itc1900"
        },
        {
            "vendor": "siemens",
            "product": "simatic_itc1900_firmware"
        },
        {
            "vendor": "siemens",
            "product": "simatic_itc1900_pro"
        },
        {
            "vendor": "siemens",
            "product": "simatic_itc1900_pro_firmware"
        },
        {
            "vendor": "siemens",
            "product": "simatic_itc2200"
        },
        {
            "vendor": "siemens",
            "product": "simatic_itc2200_firmware"
        },
        {
            "vendor": "siemens",
            "product": "simatic_itc2200_pro"
        },
        {
            "vendor": "siemens",
            "product": "simatic_itc2200_pro_firmware"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf",
        "https://github.com/LibVNC/libvncserver/commit/a64c3b37af9a6c8f8009d7516874b8d266b42bae",
        "https://github.com/LibVNC/libvncserver/commit/c2c4b81e6cb3b485fb1ec7ba9e7defeb889f6ba7",
        "https://github.com/LibVNC/libvncserver/commit/c5ba3fee85a7ecbbca1df5ffd46d32b92757bc2a",
        "https://github.com/LibVNC/libvncserver/commit/e34bcbb759ca5bef85809967a268fdf214c1ad2c",
        "https://github.com/LibVNC/libvncserver/issues/273",
        "https://lists.debian.org/debian-lts-announce/2019/01/msg00029.html",
        "https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html",
        "https://usn.ubuntu.com/3877-1/",
        "https://usn.ubuntu.com/4547-1/",
        "https://usn.ubuntu.com/4587-1/",
        "https://www.openwall.com/lists/oss-security/2018/12/10/8",
        "https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf",
        "https://github.com/LibVNC/libvncserver/commit/a64c3b37af9a6c8f8009d7516874b8d266b42bae",
        "https://github.com/LibVNC/libvncserver/commit/c2c4b81e6cb3b485fb1ec7ba9e7defeb889f6ba7",
        "https://github.com/LibVNC/libvncserver/commit/c5ba3fee85a7ecbbca1df5ffd46d32b92757bc2a",
        "https://github.com/LibVNC/libvncserver/commit/e34bcbb759ca5bef85809967a268fdf214c1ad2c",
        "https://github.com/LibVNC/libvncserver/issues/273",
        "https://lists.debian.org/debian-lts-announce/2019/01/msg00029.html",
        "https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html",
        "https://usn.ubuntu.com/3877-1/",
        "https://usn.ubuntu.com/4547-1/",
        "https://usn.ubuntu.com/4587-1/",
        "https://www.openwall.com/lists/oss-security/2018/12/10/8"
    ]
}