{
    "id": "CVE-2021-21973",
    "published": "2021-02-24 17:15:15",
    "last_modified": "2026-06-17 03:36:28",
    "cvss_score": "5.3",
    "cvss_severity": "MEDIUM",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
    "cwe": "CWE-918",
    "description": "The vSphere Client (HTML5) contains an SSRF (Server Side Request Forgery) vulnerability due to improper validation of URLs in a vCenter Server plugin. A malicious actor with network access to port 443 may exploit this issue by sending a POST request to vCenter Server plugin leading to information disclosure. This affects: VMware vCenter Server (7.x before 7.0 U1c, 6.7 before 6.7 U3l and 6.5 before 6.5 U3n) and VMware Cloud Foundation (4.x before 4.2 and 3.x before 3.10.1.2).",
    "epss_score": "0.87640",
    "epss_percentile": "0.99756",
    "kev": 1,
    "kev_due": "2022-03-21",
    "has_exploit": 0,
    "updated_at": "2026-09-26 18:27:08",
    "priority": {
        "rank": 1,
        "label": "Patch first",
        "why": "On CISA KEV — known exploited in the wild, due 2022-03-21."
    },
    "products": [
        {
            "vendor": "vmware",
            "product": "cloud_foundation"
        },
        {
            "vendor": "vmware",
            "product": "vcenter_server"
        }
    ],
    "kev_detail": {
        "cve_id": "CVE-2021-21973",
        "date_added": "2022-03-07",
        "due_date": "2022-03-21",
        "vendor": "VMware",
        "product": "vCenter Server and Cloud Foundation",
        "name": "VMware vCenter Server and Cloud Foundation Server Side Request Forgery (SSRF) Vulnerability",
        "ransomware": 0
    },
    "exploits": [],
    "refs_list": [
        "https://www.vmware.com/security/advisories/VMSA-2021-0002.html",
        "https://www.vmware.com/security/advisories/VMSA-2021-0002.html",
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21973"
    ]
}