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Critical severity9.8CISA KEVNVD Advisory· Published Sep 7, 2021· Updated Jun 17, 2026

CVE-2021-40539

CVE-2021-40539

Description

Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API authentication bypass with resultant remote code execution.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

13

Zohocorp/Manageengine Adselfservice Plus10 versions
cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:*:*:*:*:*:*:*:*+ 9 more
- cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:*:*:*:*:*:*:*:*range: <6.1
- cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:6.1:-:*:*:*:*:*:*
- cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:6.1:6100:*:*:*:*:*:*
- cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:6.1:6101:*:*:*:*:*:*
- cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:6.1:6102:*:*:*:*:*:*
- cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:6.1:6103:*:*:*:*:*:*
- cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:6.1:6104:*:*:*:*:*:*
- cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:6.1:6105:*:*:*:*:*:*
- cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:6.1:6106:*:*:*:*:*:*
- cpe:2.3:a:zohocorp:manageengine_adselfservice_plus:6.1:6113:*:*:*:*:*:*
Zoho/ManageEngine ADSelfService Plusdescription
Zoho/ManageEngine Service Plusllm-fuzzy
Range: <=6113
Manageengine/ADSelfService Plusllm-fuzzy
Range: <=6113

Patches

Vulnerability mechanics

References

4

www.manageengine.com/products/self-service-password/kb/how-to-fix-authentication-bypass-vulnerability-in-REST-API.htmlnvdPatchVendor Advisory
packetstormsecurity.com/files/165085/ManageEngine-ADSelfService-Plus-Authentication-Bypass-Code-Execution.htmlnvdExploitThird Party AdvisoryVDB Entry
www.cisa.gov/known-exploited-vulnerabilities-catalognvdUS Government Resource
www.manageengine.comnvdProduct

News mentions

1

Ransomware Tactics, Techniques, and Procedures in a Shifting Threat Landscape
Mandiant Threat Intelligence · Mar 16, 2026