{"id":"CVE-2021-40539","aliases":[],"url":"https://o3.security/vulnerability/CVE-2021-40539","summary":"Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API authentication bypass with resultant remote code execution.","details":"Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API authentication bypass with resultant remote code execution.","published":"2021-09-07T17:15:07.367","modified":"2026-06-17T04:07:06.460","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.9896,"percentile":0.99926,"asOf":"2026-08-27"},"cisaKev":{"dateAdded":"2021-11-03","dueDate":"2021-11-17","knownRansomwareCampaignUse":true},"exploitsKnown":7,"affectedPackages":[],"fix":null,"references":[{"type":"EXPLOIT","url":"http://packetstormsecurity.com/files/165085/ManageEngine-ADSelfService-Plus-Authentication-Bypass-Code-Execution.html"},{"type":"WEB","url":"https://www.manageengine.com"},{"type":"FIX","url":"https://www.manageengine.com/products/self-service-password/kb/how-to-fix-authentication-bypass-vulnerability-in-REST-API.html"},{"type":"EXPLOIT","url":"http://packetstormsecurity.com/files/165085/ManageEngine-ADSelfService-Plus-Authentication-Bypass-Code-Execution.html"},{"type":"WEB","url":"https://www.manageengine.com"},{"type":"FIX","url":"https://www.manageengine.com/products/self-service-password/kb/how-to-fix-authentication-bypass-vulnerability-in-REST-API.html"},{"type":"WEB","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40539"}],"provenance":{"sources":["OSV.dev","NVD","CISA KEV","FIRST.org (EPSS)"],"lastVerified":"2026-06-17T04:07:06.460"}}