{
    "id": "CVE-2021-21985",
    "published": "2021-05-26 15:15:07",
    "last_modified": "2026-08-12 05:17:36",
    "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-918",
    "description": "The vSphere Client (HTML5) contains a remote code execution vulnerability due to lack of input validation in the Virtual SAN Health Check plug-in which is enabled by default in vCenter Server. A malicious actor with network access to port 443 may exploit this issue to execute commands with unrestricted privileges on the underlying operating system that hosts vCenter Server.",
    "epss_score": "0.99999",
    "epss_percentile": "0.99993",
    "kev": 1,
    "kev_due": "2021-11-17",
    "has_exploit": 0,
    "updated_at": "2026-09-26 18:27:29",
    "priority": {
        "rank": 1,
        "label": "Patch first",
        "why": "On CISA KEV — known exploited in the wild, due 2021-11-17."
    },
    "products": [
        {
            "vendor": "vmware",
            "product": "cloud_foundation"
        },
        {
            "vendor": "vmware",
            "product": "vcenter_server"
        }
    ],
    "kev_detail": {
        "cve_id": "CVE-2021-21985",
        "date_added": "2021-11-03",
        "due_date": "2021-11-17",
        "vendor": "VMware",
        "product": "vCenter Server",
        "name": "VMware vCenter Server Improper Input Validation Vulnerability",
        "ransomware": 1
    },
    "exploits": [],
    "refs_list": [
        "http://packetstormsecurity.com/files/162812/VMware-Security-Advisory-2021-0010.html",
        "http://packetstormsecurity.com/files/163487/VMware-vCenter-Server-Virtual-SAN-Health-Check-Remote-Code-Execution.html",
        "https://www.vmware.com/security/advisories/VMSA-2021-0010.html",
        "http://packetstormsecurity.com/files/162812/VMware-Security-Advisory-2021-0010.html",
        "http://packetstormsecurity.com/files/163487/VMware-vCenter-Server-Virtual-SAN-Health-Check-Remote-Code-Execution.html",
        "https://www.vmware.com/security/advisories/VMSA-2021-0010.html",
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21985"
    ]
}