CVE-2021-40539
CriticalPublished
Zoho ManageEngine ADSelfService Plus Authentication Bypass Vulnerability
- Published
- Sep 7, 2021
- Updated
- Oct 21, 2025
- Assigning CNA
- mitre
- Evidence observed
- Nov 3, 2021
Primary CVSS
9.8/ 10Critical
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H99.0%
High · next 30 days
- Percentile
- 99.9%
- Model date
- Oct 14, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
Summary
Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API authentication bypass with resultant remote code execution.
Sources
Repository evidence: Files: 2 · Repositories: 2
1 Module1 Template
modules/exploits/windows/http/manageengine_adselfservice_plus_cve_2021_40539.rb
Metasploit Framework modulesDeclared conditions
- platform: Java($.exploit_windows/http/manageengine_adselfservice_plus_cve_2021_40539.platform)
- verification: check_declared($.exploit_windows/http/manageengine_adselfservice_plus_cve_2021_40539.check)
http/cves/2021/CVE-2021-40539.yaml
Nuclei TemplatesDeclared conditions
- network: http($.protocol_keys)
- verification: status,word($.matchers[*].type)
Responsible use
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