{
    "id": "CVE-2018-5440",
    "published": "2018-02-15 10:29:00",
    "last_modified": "2026-06-17 02:00:19",
    "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-121",
    "description": "A Stack-based Buffer Overflow issue was discovered in 3S-Smart CODESYS Web Server. Specifically: all Microsoft Windows (also WinCE) based CODESYS web servers running stand-alone Version 2.3, or as part of the CODESYS runtime system running prior to Version V1.1.9.19. A crafted request may cause a buffer overflow and could therefore execute arbitrary code on the web server or lead to a denial-of-service condition due to a crash in the web server.",
    "epss_score": "0.03096",
    "epss_percentile": "0.87381",
    "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": "3s-software",
            "product": "codesys_runtime_system"
        },
        {
            "vendor": "3s-software",
            "product": "codesys_web_server"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "http://www.securityfocus.com/bid/102909",
        "https://ics-cert.us-cert.gov/advisories/ICSA-18-032-02",
        "http://www.securityfocus.com/bid/102909",
        "https://ics-cert.us-cert.gov/advisories/ICSA-18-032-02"
    ]
}