{
    "id": "CVE-2021-21220",
    "published": "2021-04-26 17:15:08",
    "last_modified": "2026-06-17 03:35:03",
    "cvss_score": "8.8",
    "cvss_severity": "HIGH",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
    "cwe": "CWE-787",
    "description": "Insufficient validation of untrusted input in V8 in Google Chrome prior to 89.0.4389.128 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.",
    "epss_score": "0.70435",
    "epss_percentile": "0.99370",
    "kev": 1,
    "kev_due": "2021-11-17",
    "has_exploit": 0,
    "updated_at": "2026-09-26 18:27:20",
    "priority": {
        "rank": 1,
        "label": "Patch first",
        "why": "On CISA KEV — known exploited in the wild, due 2021-11-17."
    },
    "products": [
        {
            "vendor": "fedoraproject",
            "product": "fedora"
        },
        {
            "vendor": "google",
            "product": "chrome"
        }
    ],
    "kev_detail": {
        "cve_id": "CVE-2021-21220",
        "date_added": "2021-11-03",
        "due_date": "2021-11-17",
        "vendor": "Google",
        "product": "Chromium V8",
        "name": "Google Chromium V8 Improper Input Validation Vulnerability",
        "ransomware": 0
    },
    "exploits": [],
    "refs_list": [
        "http://packetstormsecurity.com/files/162437/Google-Chrome-XOR-Typer-Out-Of-Bounds-Access-Remote-Code-Execution.html",
        "http://packetstormsecurity.com/files/176210/Chrome-V8-JIT-XOR-Arbitrary-Code-Execution.html",
        "https://chromereleases.googleblog.com/2021/04/stable-channel-update-for-desktop.html",
        "https://crbug.com/1196683",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EAJ42L4JFPBJATCZ7MOZQTUDGV4OEHHG/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U3GZ42MYPGD35V652ZPVPYYS7A7LVXVY/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VUZBGKGVZADNA3I24NVG7HAYYUTOSN5A/",
        "https://security.gentoo.org/glsa/202104-08",
        "http://packetstormsecurity.com/files/162437/Google-Chrome-XOR-Typer-Out-Of-Bounds-Access-Remote-Code-Execution.html",
        "http://packetstormsecurity.com/files/176210/Chrome-V8-JIT-XOR-Arbitrary-Code-Execution.html",
        "https://chromereleases.googleblog.com/2021/04/stable-channel-update-for-desktop.html",
        "https://crbug.com/1196683",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EAJ42L4JFPBJATCZ7MOZQTUDGV4OEHHG/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U3GZ42MYPGD35V652ZPVPYYS7A7LVXVY/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VUZBGKGVZADNA3I24NVG7HAYYUTOSN5A/",
        "https://security.gentoo.org/glsa/202104-08",
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21220"
    ]
}