{
    "id": "CVE-2021-42911",
    "published": "2022-03-29 20:15:07",
    "last_modified": "2026-06-17 04:10:15",
    "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-134",
    "description": "A Format String vulnerability exists in DrayTek Vigor 2960 <= 1.5.1.3, DrayTek Vigor 3900 <= 1.5.1.3, and DrayTek Vigor 300B <= 1.5.1.3 in the mainfunction.cgi file via a crafted HTTP message containing malformed QUERY STRING, which could let a remote malicious user execute arbitrary code.",
    "epss_score": "0.03524",
    "epss_percentile": "0.88929",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-09 18:17:29",
    "priority": {
        "rank": 3,
        "label": "In your normal cycle",
        "why": "Critical by CVSS (9.8), but no sign of active exploitation."
    },
    "products": [
        {
            "vendor": "draytek",
            "product": "vigor2960"
        },
        {
            "vendor": "draytek",
            "product": "vigor2960_firmware"
        },
        {
            "vendor": "draytek",
            "product": "vigor300b"
        },
        {
            "vendor": "draytek",
            "product": "vigor300b_firmware"
        },
        {
            "vendor": "draytek",
            "product": "vigor3900"
        },
        {
            "vendor": "draytek",
            "product": "vigor3900_firmware"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "https://gist.github.com/Cossack9989/e9c1c2d2e69b773ca4251acdd77f2835",
        "https://gist.github.com/Cossack9989/e9c1c2d2e69b773ca4251acdd77f2835"
    ]
}