Remote code execution in Zoho ADSelfService Plus

Published: 2021-09-09 | Updated: 2021-11-04
Risk Critical
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-40539
Exploitation vector Network
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software
Zoho ManageEngine ADSelfService Plus
Client/Desktop applications / Software for system administration

Vendor Zoho Corporation

Security Bulletin

This security bulletin contains one critical risk vulnerability.

1) Improper access control

EUVDB-ID: #VU56414

Risk: Critical


CVE-ID: CVE-2021-40539

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: Yes


The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to improper access restrictions to the "/RestAPI/LogonCustomization" and "/RestAPI/Connection" REST API endpoints. A remote non-authenticated attacker can send specially HTTP requests to the aforementioned REST API endpoints and execute arbitrary code on the system.

Note, the vulnerability is being actively exploited in the wild.


Install updates from vendor's website.

Vulnerable software versions

Zoho ManageEngine ADSelfService Plus: 6000 - 6113

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?