{
    "id": "CVE-2021-1834",
    "published": "2021-09-08 15:15:10",
    "last_modified": "2026-06-17 03:32:38",
    "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-787",
    "description": "An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Big Sur 11.3, Security Update 2021-002 Catalina, Security Update 2021-003 Mojave. A malicious application may be able to execute arbitrary code with kernel privileges.",
    "epss_score": "0.02975",
    "epss_percentile": "0.86898",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-11 18:17:24",
    "priority": {
        "rank": 3,
        "label": "In your normal cycle",
        "why": "Critical by CVSS (9.8), but no sign of active exploitation."
    },
    "products": [
        {
            "vendor": "apple",
            "product": "mac_os_x"
        },
        {
            "vendor": "apple",
            "product": "macos"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "https://support.apple.com/en-us/HT212325",
        "https://support.apple.com/en-us/HT212326",
        "https://support.apple.com/en-us/HT212327",
        "https://support.apple.com/en-us/HT212325",
        "https://support.apple.com/en-us/HT212326",
        "https://support.apple.com/en-us/HT212327"
    ]
}