{
    "id": "CVE-2021-40539",
    "published": "2021-09-07 17:15:07",
    "last_modified": "2026-06-17 04:07:06",
    "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-706",
    "description": "Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API authentication bypass with resultant remote code execution.",
    "epss_score": "0.98960",
    "epss_percentile": "0.99929",
    "kev": 1,
    "kev_due": "2021-11-17",
    "has_exploit": 0,
    "updated_at": "2026-09-26 18:27:59",
    "priority": {
        "rank": 1,
        "label": "Patch first",
        "why": "On CISA KEV — known exploited in the wild, due 2021-11-17."
    },
    "products": [
        {
            "vendor": "zohocorp",
            "product": "manageengine_adselfservice_plus"
        }
    ],
    "kev_detail": {
        "cve_id": "CVE-2021-40539",
        "date_added": "2021-11-03",
        "due_date": "2021-11-17",
        "vendor": "Zoho",
        "product": "ManageEngine",
        "name": "Zoho ManageEngine ADSelfService Plus Authentication Bypass Vulnerability",
        "ransomware": 1
    },
    "exploits": [],
    "refs_list": [
        "http://packetstormsecurity.com/files/165085/ManageEngine-ADSelfService-Plus-Authentication-Bypass-Code-Execution.html",
        "https://www.manageengine.com",
        "https://www.manageengine.com/products/self-service-password/kb/how-to-fix-authentication-bypass-vulnerability-in-REST-API.html",
        "http://packetstormsecurity.com/files/165085/ManageEngine-ADSelfService-Plus-Authentication-Bypass-Code-Execution.html",
        "https://www.manageengine.com",
        "https://www.manageengine.com/products/self-service-password/kb/how-to-fix-authentication-bypass-vulnerability-in-REST-API.html",
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40539"
    ]
}