{"id":"CVE-2021-40539","aliases":["EUVD-2021-27714","GHSA-gww8-rh9f-5mjq"],"status":"published","title":"Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API...","description":"Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API authentication bypass with resultant remote code execution.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.9896,"percentile":0.99929,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":true,"fix_available":false},"cwes":["CWE-287","CWE-55","CWE-706"],"published":"2021-09-07T16:06:58Z","modified":"2026-06-17T04:07:06Z","kev":{"date_added":"2021-11-03","due_date":"2021-11-17","required_action":"Apply updates per vendor instructions.","known_ransomware_use":"Known"},"exploitation":[{"source":"euvd","since":"2021-11-03"},{"source":"kev","since":"2021-11-03"}],"exploits":[{"source":"metasploit","id":"exploit/windows/http/manageengine_adselfservice_plus_cve_2021_40539","title":"ManageEngine ADSelfService Plus CVE-2021-40539","type":"exploit","platform":"Java","date":"2021-09-07","verified":true,"url":"https://www.rapid7.com/db/modules/exploit/windows/http/manageengine_adselfservice_plus_cve_2021_40539"},{"source":"pocgithub","id":"DarkSprings/CVE-2021-40539","title":"DarkSprings/CVE-2021-40539","date":"2021-09-17","url":"https://github.com/DarkSprings/CVE-2021-40539"},{"source":"pocgithub","id":"synacktiv/CVE-2021-40539","title":"synacktiv/CVE-2021-40539","date":"2021-11-03","url":"https://github.com/synacktiv/CVE-2021-40539"},{"source":"pocgithub","id":"lpyydxs/CVE-2021-40539","title":"lpyydxs/CVE-2021-40539","date":"2024-10-12","url":"https://github.com/lpyydxs/CVE-2021-40539"},{"source":"pocgithub","id":"lpyzds/CVE-2021-40539","title":"lpyzds/CVE-2021-40539","date":"2024-10-12","url":"https://github.com/lpyzds/CVE-2021-40539"},{"source":"pocgithub","id":"Bu0uCat/ADSelfService-Plus-RCE-CVE-2021-40539","title":"Bu0uCat/ADSelfService-Plus-RCE-CVE-2021-40539","date":"2024-10-16","url":"https://github.com/Bu0uCat/ADSelfService-Plus-RCE-CVE-2021-40539"},{"source":"nuclei","id":"CVE-2021-40539","title":"Zoho ManageEngine ADSelfService Plus v6113 - Unauthenticated Remote Command Execution","type":"detection template","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-40539.yaml"}],"products":[{"vendor":"zoho","product":"manageengine"},{"vendor":"zohocorp","product":"manageengine_adselfservice_plus"}],"references":[{"url":"https://www.manageengine.com","tags":["x_refsource_MISC","x_transferred","Product"]},{"url":"https://www.manageengine.com/products/self-service-password/kb/how-to-fix-authentication-bypass-vulnerability-in-REST-API.html","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"http://packetstormsecurity.com/files/165085/ManageEngine-ADSelfService-Plus-Authentication-Bypass-Code-Execution.html","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","VDB Entry"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40539","tags":["government-resource","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-40539"},{"url":"https://github.com/advisories/GHSA-gww8-rh9f-5mjq"}],"sources":{"cve":[{"id":"CVE-2021-40539","description":"Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API authentication bypass with resultant remote code execution.","status":"published","published":"2021-09-07T16:06:58Z","modified":"2025-10-21T23:25:35.374Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"adp"}],"cwes":["CWE-706"],"updated_at":"2026-11-02T14:33:01.495293Z"}],"euvd":[{"id":"EUVD-2021-27714","description":"Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API authentication bypass with resultant remote code execution.","status":"published","published":"2021-09-07T16:06:58Z","modified":"2025-10-21T23:25:35Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"exploited_since":"2021-11-03","updated_at":"2026-11-02T20:31:25.901288Z"}],"ghsa":[{"id":"GHSA-gww8-rh9f-5mjq","title":"Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API...","description":"Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API authentication bypass with resultant remote code execution.","status":"published","published":"2022-05-24T19:13:08Z","modified":"2025-10-22T00:33:23Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-287","CWE-706"],"updated_at":"2026-11-02T15:04:08.198655Z"}],"kev":[{"id":"CVE-2021-40539","title":"Zoho ManageEngine ADSelfService Plus Authentication Bypass Vulnerability","description":"Zoho ManageEngine ADSelfService Plus contains an authentication bypass vulnerability affecting the REST API URLs which allow for remote code execution.","cwes":["CWE-55"],"kev":{"date_added":"2021-11-03","due_date":"2021-11-17","required_action":"Apply updates per vendor instructions.","known_ransomware_use":"Known"},"updated_at":"2026-11-02T17:00:17.050017Z"}],"nvd":[{"id":"CVE-2021-40539","description":"Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API authentication bypass with resultant remote code execution.","status":"published","published":"2021-09-07T17:15:07.367Z","modified":"2026-06-17T04:07:06.46Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-706"],"updated_at":"2026-11-02T14:06:58.05696Z"}]}}
