{
    "id": "CVE-2021-37973",
    "published": "2021-10-08 22:15:08",
    "last_modified": "2026-06-17 04:01:19",
    "cvss_score": "9.6",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H",
    "cwe": "CWE-416",
    "description": "Use after free in Portals in Google Chrome prior to 94.0.4606.61 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page.",
    "epss_score": "0.11735",
    "epss_percentile": "0.95932",
    "kev": 1,
    "kev_due": "2021-11-17",
    "has_exploit": 0,
    "updated_at": "2026-09-26 18:28:09",
    "priority": {
        "rank": 1,
        "label": "Patch first",
        "why": "On CISA KEV — known exploited in the wild, due 2021-11-17."
    },
    "products": [
        {
            "vendor": "debian",
            "product": "debian_linux"
        },
        {
            "vendor": "fedoraproject",
            "product": "fedora"
        },
        {
            "vendor": "google",
            "product": "chrome"
        }
    ],
    "kev_detail": {
        "cve_id": "CVE-2021-37973",
        "date_added": "2021-11-03",
        "due_date": "2021-11-17",
        "vendor": "Google",
        "product": "Chromium Portals",
        "name": "Google Chromium Portals Use-After-Free Vulnerability",
        "ransomware": 0
    },
    "exploits": [],
    "refs_list": [
        "https://chromereleases.googleblog.com/2021/09/stable-channel-update-for-desktop_24.html",
        "https://crbug.com/1251727",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4DDW7HAHTS3SDVXBQUY4SURELO5D4X7R/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PM7MOYYHJSWLIFZ4TPJTD7MSA3HSSLV2/",
        "https://www.debian.org/security/2022/dsa-5046",
        "https://chromereleases.googleblog.com/2021/09/stable-channel-update-for-desktop_24.html",
        "https://crbug.com/1251727",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4DDW7HAHTS3SDVXBQUY4SURELO5D4X7R/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PM7MOYYHJSWLIFZ4TPJTD7MSA3HSSLV2/",
        "https://www.debian.org/security/2022/dsa-5046",
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-37973"
    ]
}