{
    "id": "CVE-2022-0342",
    "published": "2022-03-28 13:15:07",
    "last_modified": "2026-06-17 04:20:25",
    "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-287",
    "description": "An authentication bypass vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.20 through 4.70, USG FLEX series firmware versions 4.50 through 5.20, ATP series firmware versions 4.32 through 5.20, VPN series firmware versions 4.30 through 5.20, and NSG series firmware versions V1.20 through V1.33 Patch 4, which could allow an attacker to bypass the web authentication and obtain administrative access of the device.",
    "epss_score": "0.95134",
    "epss_percentile": "0.99864",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-09-30 18:17:30",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "EPSS 95.1% — above the 10% action threshold."
    },
    "products": [
        {
            "vendor": "zyxel",
            "product": "atp100"
        },
        {
            "vendor": "zyxel",
            "product": "atp100_firmware"
        },
        {
            "vendor": "zyxel",
            "product": "atp100w"
        },
        {
            "vendor": "zyxel",
            "product": "atp100w_firmware"
        },
        {
            "vendor": "zyxel",
            "product": "atp200"
        },
        {
            "vendor": "zyxel",
            "product": "atp200_firmware"
        },
        {
            "vendor": "zyxel",
            "product": "atp500"
        },
        {
            "vendor": "zyxel",
            "product": "atp500_firmware"
        },
        {
            "vendor": "zyxel",
            "product": "atp700"
        },
        {
            "vendor": "zyxel",
            "product": "atp700_firmware"
        },
        {
            "vendor": "zyxel",
            "product": "atp800"
        },
        {
            "vendor": "zyxel",
            "product": "atp800_firmware"
        },
        {
            "vendor": "zyxel",
            "product": "usg_flex_100"
        },
        {
            "vendor": "zyxel",
            "product": "usg_flex_100_firmware"
        },
        {
            "vendor": "zyxel",
            "product": "usg_flex_100w"
        },
        {
            "vendor": "zyxel",
            "product": "usg_flex_100w_firmware"
        },
        {
            "vendor": "zyxel",
            "product": "usg_flex_200"
        },
        {
            "vendor": "zyxel",
            "product": "usg_flex_200_firmware"
        },
        {
            "vendor": "zyxel",
            "product": "usg_flex_500"
        },
        {
            "vendor": "zyxel",
            "product": "usg_flex_500_firmware"
        },
        {
            "vendor": "zyxel",
            "product": "usg_flex_700"
        },
        {
            "vendor": "zyxel",
            "product": "usg_flex_700_firmware"
        },
        {
            "vendor": "zyxel",
            "product": "usg40"
        },
        {
            "vendor": "zyxel",
            "product": "usg40_firmware"
        },
        {
            "vendor": "zyxel",
            "product": "usg40w"
        },
        {
            "vendor": "zyxel",
            "product": "usg40w_firmware"
        },
        {
            "vendor": "zyxel",
            "product": "usg60"
        },
        {
            "vendor": "zyxel",
            "product": "usg60_firmware"
        },
        {
            "vendor": "zyxel",
            "product": "usg60w"
        },
        {
            "vendor": "zyxel",
            "product": "usg60w_firmware"
        },
        {
            "vendor": "zyxel",
            "product": "vpn100"
        },
        {
            "vendor": "zyxel",
            "product": "vpn100_firmware"
        },
        {
            "vendor": "zyxel",
            "product": "vpn50"
        },
        {
            "vendor": "zyxel",
            "product": "vpn50_firmware"
        },
        {
            "vendor": "zyxel",
            "product": "zywall_110"
        },
        {
            "vendor": "zyxel",
            "product": "zywall_110_firmware"
        },
        {
            "vendor": "zyxel",
            "product": "zywall_1100"
        },
        {
            "vendor": "zyxel",
            "product": "zywall_1100_firmware"
        },
        {
            "vendor": "zyxel",
            "product": "zywall_310"
        },
        {
            "vendor": "zyxel",
            "product": "zywall_310_firmware"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "https://www.zyxel.com/support/Zyxel-security-advisory-for-authentication-bypass-vulnerability-of-firewalls.shtml",
        "https://www.zyxel.com/support/Zyxel-security-advisory-for-authentication-bypass-vulnerability-of-firewalls.shtml"
    ]
}