{
    "id": "CVE-2019-19521",
    "published": "2019-12-05 00:15:11",
    "last_modified": "2026-06-17 02:26:48",
    "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": "libc in OpenBSD 6.6 allows authentication bypass via the -schallenge username, as demonstrated by smtpd, ldapd, or radiusd. This is related to gen/auth_subr.c and gen/authenticate.c in libc (and login/login.c and xenocara/app/xenodm/greeter/verify.c).",
    "epss_score": "0.02736",
    "epss_percentile": "0.85761",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-13 18:17:22",
    "priority": {
        "rank": 3,
        "label": "In your normal cycle",
        "why": "Critical by CVSS (9.8), but no sign of active exploitation."
    },
    "products": [
        {
            "vendor": "openbsd",
            "product": "openbsd"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html",
        "http://seclists.org/fulldisclosure/2019/Dec/14",
        "http://www.openwall.com/lists/oss-security/2019/12/04/5",
        "http://www.openwall.com/lists/oss-security/2019/12/04/6",
        "https://seclists.org/bugtraq/2019/Dec/8",
        "https://www.openbsd.org/errata66.html",
        "https://www.openwall.com/lists/oss-security/2019/12/04/5",
        "http://packetstormsecurity.com/files/155572/Qualys-Security-Advisory-OpenBSD-Authentication-Bypass-Privilege-Escalation.html",
        "http://seclists.org/fulldisclosure/2019/Dec/14",
        "http://www.openwall.com/lists/oss-security/2019/12/04/5",
        "http://www.openwall.com/lists/oss-security/2019/12/04/6",
        "https://seclists.org/bugtraq/2019/Dec/8",
        "https://www.openbsd.org/errata66.html",
        "https://www.openwall.com/lists/oss-security/2019/12/04/5"
    ]
}