{
    "id": "CVE-2001-1559",
    "published": "2001-12-31 05:00:00",
    "last_modified": "2026-06-16 21:56:30",
    "cvss_score": "5.5",
    "cvss_severity": "MEDIUM",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
    "cwe": "CWE-476",
    "description": "The uipc system calls (uipc_syscalls.c) in OpenBSD 2.9 and 3.0 provide user mode return instead of versus rval kernel mode values to the fdrelease function, which allows local users to cause a denial of service and trigger a null dereference.",
    "epss_score": "0.01482",
    "epss_percentile": "0.73224",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-10-10 18:17:02",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "openbsd",
            "product": "openbsd"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "21167",
            "title": "OpenBSD 2.x/3.0 - User Mode Return Value Denial of Service",
            "date": "2001-12-03",
            "url": "https://www.exploit-db.com/exploits/21167"
        }
    ],
    "refs_list": [
        "http://archives.neohapsis.com/archives/bugtraq/2001-12/0014.html",
        "http://monkey.org/openbsd/archive/tech/0112/msg00015.html",
        "http://www.iss.net/security_center/static/7690.php",
        "http://archives.neohapsis.com/archives/bugtraq/2001-12/0014.html",
        "http://monkey.org/openbsd/archive/tech/0112/msg00015.html",
        "http://www.iss.net/security_center/static/7690.php"
    ]
}