{
    "id": "CVE-2020-27304",
    "published": "2021-10-21 16:15:07",
    "last_modified": "2026-06-17 03:09:08",
    "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-23",
    "description": "The CivetWeb web library does not validate uploaded filepaths when running on an OS other than Windows, when using the built-in HTTP form-based file upload mechanism, via the mg_handle_form_request API. Web applications that use the file upload form handler, and use parts of the user-controlled filename in the output path, are susceptible to directory traversal",
    "epss_score": "0.03241",
    "epss_percentile": "0.87956",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-10 18:17:23",
    "priority": {
        "rank": 3,
        "label": "In your normal cycle",
        "why": "Critical by CVSS (9.8), but no sign of active exploitation."
    },
    "products": [
        {
            "vendor": "civetweb_project",
            "product": "civetweb"
        },
        {
            "vendor": "siemens",
            "product": "sinec_infrastructure_network_services"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf",
        "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf",
        "https://groups.google.com/g/civetweb/c/yPBxNXdGgJQ",
        "https://jfrog.com/blog/cve-2020-27304-rce-via-directory-traversal-in-civetweb-http-server/",
        "https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf",
        "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf",
        "https://groups.google.com/g/civetweb/c/yPBxNXdGgJQ",
        "https://jfrog.com/blog/cve-2020-27304-rce-via-directory-traversal-in-civetweb-http-server/"
    ]
}